Giant Japanese Spider Crab

Its paws are especially adapted for gripping and climbing with rough pads on the palms and soles helping it to grip tree trunks and branches. Both front and hind paws have long sharp claws and each paw has five digits. On the front paw, two fingers are opposed to the other three, rather like a human's thumb, so they are able to be moved in opposition to the fingers. This allows the koala to grip more securely. On the hind paw, there is no claw on the big toe, and the second and third toes are fused together to form a 'grooming claw'.

Koalas have a thick woolly fur which protects them from both high and low temperatures.It also acts like a 'raincoat' to repel moisture when it rains. The fur varies in colour from light grey to brown, with patches of white on the chest and neck, inside arms and legs and inside the ears. Mature males are recognisable by the brown 'scent gland' in the centre of their white chest.

The fur on the koala's bottom is densely packed to provide a 'cushion' for the hard branches it sits on, and has a 'speckled' appearance which makes koalas hard to spot from the ground.

An adult male koala can weigh between 8 and 14 kilograms and a female between 6 and 11 kilograms, with the heavier animals coming from the southern areas where they have adapted to the colder climate by an increase in body weight and thicker fur. If you see Koalas in Queensland, they look noticably smaller than Koalas from Victoria.

Koalas are mostly nocturnal animals and they are most active during the night and at dawn and dusk. This is because in the cooler hours they are less likely to lose precious moisture and energy than they would during the hotter daylight hours. An average of eighteen to twenty hours each day are spent resting and sleeping, and the remainder for feeding, moving around, grooming and social interaction.

The Koala's nose is one of its most important features, and it has a very highly developed sense of smell. This is necessary to differentiate between types of gum leaves and to detect whether the leaves are poisonous or not.

The Koala's digestive system is especially adapted to detoxify the poisonous chemicals in the leaves. The toxins are thought to be produced by the gum trees as a protection against leaf-eating animals like insects. Trees which grow on less fertile soils seem to have more toxins than those growing on good soils. This could be one reason why koalas will eat only certain types of eucalypts, and why they will sometimes even avoid them when they are growing on certain soils.

When approaching a tree to climb, koalas spring from the ground and catch their front claws in the bark, then bound upwards. Claw marks are usually visible on the trunks of trees regularly used as home trees by koalas.

In the safety of their home trees, koalas assume a wide variety of sitting and sleeping postures, and they will move around the tree during the day and night to catch the sun or the breezes. On hot days it is common to see them with limbs dangling in an effort to keep cool, and during colder times, curled up in a ball to conserve body heat.

When descending a tree, koalas come down bottom first. They regularly descend to the ground to change trees, and it is there that they are most vulnerable to predators such as dogs, foxes and dingoes, and also to the risk of injury or death from cars. They walk with an awkward-looking gait and can also run. Koalas have sometimes been observed swimming, but this is not a regular occurrence.

Koalas use a range of sounds to communicate with one another over relatively large distances.

There is a deep grunting bellow which the male uses to signify its social and physical position. Males save fighting energy by bellowing their dominance and they also bellow to allow other animals to accurately locate the position of the caller.

Females do not bellow as often as males, but their calls too are used to express aggression as well as being part of sexual behaviour, often giving the impression of fighting.

Mothers and babies make soft clicking, squeaking sounds and gentle humming or murmuring sounds to one another, as well as gentle grunts to signal displeasure or annoyance.

All koalas share one common call which is elicited by fear. It is a sickening cry like a baby screaming and is made by animals under stress. It is often accompanied by shaking.

Koalas also communicate by marking their trees with their scent.
Breeding

The main characteristics of marsupials which differentiate them from other mammals is that they give birth to immature young which then develop further in a pouch. The word 'marsupial' comes from the Latin word marsupium, meaning 'pouch.' Most, but not all marsupials have a pouch in which to raise their young.

The breeding season for koalas runs roughly from September to March. This is a time of increased activity, and sound levels increase as males bellow more frequently. This is also when the young from the previous year are weaning from their mothers.

Females generally start breeding at about three or four years of age and usually produce only one offspring each year. However, not all females in a wild population will breed each year. Some produce offspring only every two or three years, depending on factors such as the age of the female and the quality of its habitat. In the average female's life span of about twelve years, this means that one female may produce only 5 or 6 offspring over her lifetime.

Once a female has conceived, it is only 34-36 days before the birth of the new baby, called a "joey". The tiny baby which is roughly 2 centimetres long and weighs less than 1 gram, looks rather like a pink jellybean as it is totally hairless, blind and has no ears.

The joey makes its way from the birth canal to the pouch completely unaided, relying on its already well-developed senses of smell and touch, strong forelimbs and claws and an amazing sense of direction. Once inside the safety of the pouch, it attaches itself to one of the two teats, which swells to fill its mouth. This prevents the joey from being dislodged from its source of food. The mother contracts her strong sphincter muscle at the pouch opening to prevent the baby from falling out.

The young koala drinks only mother's milk for the first six to seven months and remains in the pouch for that time, slowly growing and developing eyes, ears, fur etc. At about 22 weeks, its eyes open and it begins to peep out of the pouch. From about 22 to 30 weeks, it begins to feed upon a substance called "pap" which the mother produces in addition to milk. Pap is a specialised form of faeces, or droppings, which forms an important part of the young koala's diet, allowing it to make the transition from milk to eucalyptus leaves, rather like a human baby is fed "mushy" food when it starts to eat solids. Pap is soft and runny and thought to come from the caecum(a blind ended pouch at the junction of the small and large intestines). It allows the mother to pass on micro-organisms present in her own digestive system which are essential to the digestion of eucalyptus leaves.It is also a rich source of protein.

The joey leans out of the pouch opening on the centre of the mother's abdomen to feed on the pap, stretching it open towards the source of the pap. The baby feeds regularly on the pap and as it grows it emerges totally from the pouch and lies on its mother's belly to feed. Eventually it begins to feed upon fresh leaves as it rides on her back. The young koala continues to take milk from its mother until it is about a year old, but as it can no longer fit in the pouch, the mother's teat elongates to protrude from the pouch opening. Young koalas remain with their mothers until the appearance outside the pouch of the next season's joey. It is then time for the previous year's joey to wean and find its own home range. If a female does not reproduce each year, the joey stays with her longer and has a greater chance of survival when it does leave its mother.

Females generally live longer than males as the males are more often injured during fights, they tend to travel longer distances with the resulting increase in risks such as cars and dogs, and they more often occupy poorer habitat. Putting a life span on the average koala can be misleading because some survive only for a period of weeks or months, while others survive to old age. Koalas living in an undisturbed habitat would have a greater life expectancy than those living in suburbia. Some estimates for the average life-span of an adult wild male koala are ten years, but the average survival rate for a dispersing sub-adult male living near a highway or a housing estate is closer to two or three years.

There are always some transient animals who hang around the edges of stable groups. They are usually young males and will often drift between breeding aggregations waiting for an opportunity to become a permanent resident.

Since European settlement, approximately 80% of Australia's eucalypt forests have been decimated. Of the remaining 20% almost none is protected and most occurs on privately-owned land.

Settlers favoured the rich fertile lands along the eastern seaboard to have their farms and urban developments. Unfortunately, this is where the majority of koalas are already living because they also like to live in trees which are growing in fertile soils.

The main causes of loss of habitat include:

agriculture, housing, mining, forestry,factories and roads.

The results of this would include:-

· loss of habitat

· increased disturbance by humans

· injury or death from traffic

· injury or death from dogs and cats

· effects of garden pesticides getting into waterways

· increased competition for food and territory because of overcrowding

· increased stress on animals, making them more susceptible to disease.

It has also been documented that over 4000 koalas are killed each year by dogs and cars. It easy to see that the biggest threat to the Koala population is the human.
BUSHFIRES

Koala populations in fragmented areas of bushland are at great risk of localised extinction from a single fire which may wipe out an entire habitat. Bushfires are extremely common in the Summer months.

Changes in the balance of the ecosystem can lead to dieback of trees. The cutting back of the original vast forests has created patches of forest separated from each other by treeless land. Small, isolated patches of forest are prone to dieback. Dieback is a general term for the gradual dying of trees due to factors such as land degradation, leaching of soil nutrients, changes in the composition of vegetation communities, rising water levels underground, salination of the soil, erosion caused by wind and water, exposure to weather and excessive defoliation (or loss of leaves).

The underlying cause of all these factors appears to be the clearing and disturbance of forests. Seventy five percent of the main koala food tree species are declining in numbers as a result of this.
OTHER THREATS

Today the natural predators of the koala do not make a significant impact on wild populations.They include goannas dingoes, powerful owls, wedge-tailed eagles, and pythons, all of which are most likely to prey upon juvenile koalas.

Feral animals are another threat koalas have had to face since European settlement. Foxes have been blamed for preying upon young koalas when their mother descends to the ground to change trees, and large feral cats may also be a problem for young koalas.

Long droughts also have an effect on the Koala population

Disease is part of the natural history of the koala. There are 4 common koala diseases caused by the chlamydia organism: conjunctivitis which can cause blindness, pneumonia, urinary tract infections and reproductive tract infections, which can cause female infertility. The symptoms of chlamydia manifest as sore eyes, chest infections, and "wet bottom" or "dirty tail". Different strains of chlamydia bacteria are thought to cause these diseases. In 1995, scientists isolated two strains called chlamydia pecorum and chlamydia pneumoniae.

Scientists now believe that the chlamydia organism has been occuring amongst koala populations for many years, and has acted as a natural population control in times of stress. The organism is harmless in populations with unlimited resources, but manifests in times of stress, such as happens when habitat is reduced. The weaker animals succumb to the disease, become sick, infertile or die, leaving the genetically stronger animals to continue breeding. In disease-free populations which have been moved to areas where they were not native or where there is not enough habitat to support them (such as on some islands off Victoria and Kangaroo Island in South Australia), problems with overpopulation have arisen because of this unnatural situation. However, this is not the case in most mainland populations, and indeed many of the mainland colonies are in decline. Koalas also suffer from a range of cancers like leukemia and skin cancers.
African Elephant

Loxodonta Africana

Where do elephants live?

Elephants will live in almost any habitat that provides plentiful food and water. Populations are scattered throughout sub-Saharan Africa and the rain forests of Central and West Africa.

What are elephants?

They are the world’s largest terrestrial mammal. There are two recognized subspecies of elephants: the savanna (bush) elephant and the forest elephant. Savanna elephants are larger than forest elephants and their tusks curve out, while forest elephants are darker and have tusks that are straighter and point downward.

An elephant’s trunk is a long nose that is used for breathing, smelling, drinking, trumpeting, and grabbing objects. African elephants have two fingerlike extensions on the tips of their trunks that are used for holding onto small objects. They also use their trunks to exhibit affection, by frequently touching and caressing one another.

They spend a lot of time eating.

It’s no great surprise that these large animals love to eat. Elephants’ diets consist of grasses, fruits, roots, and bark, and they roam across large distances foraging for food. They can eat up to 300 pounds (136 kilograms) of food and drink 30 to 50 gallons of water in one day.

Elephants are friendly.

Much like humans, elephants are social creatures that live in small family groups, usually consisting of an older matriarch and several generations of female relatives. Males are typically solitary but may live in small groups of three or four bulls. They take care of weak or injured members and even appear to grieve over dead companions.

Habitat:  Grasslands and open woodlands

Food:  Grass, leaves, and the bark of bushes and trees

Size:  Males can reach 13 feet tall and weigh up to 13,000 pounds; females are smaller

Babies:  A calf weighs about 250 pounds at birth.

Elephants keep growing throughout their lifetime!
Just Call Them"Ginormous"

Adult African elephants are huge.  Males can weigh as much as a school bus! Even their teeth are big–an adult's molar is the size of a brick. Their huge teeth help them grind and eat a lot of plant material every day. Our elephants at the Zoo and the Park each eat over 100 pounds of food each day.

When most people think of elephants, they picture the large tusks. Both male and female African elephants have long tusks, which are actually teeth. Elephants dig with their tusks and use them to lift and move objects and to protect themselves. Sadly, people hunt elephants for these teeth. One reason these giants of the animal kingdom are threatened is because people want to collect their tusks.

The forest elephant is particularly susceptible, increasingly so as the forests are being logged, attracting more people and making elephant habitat more accessible by building roads.

In contrast, some African countries insist they have too many elephants.

They demonstrate an excess of elephants by increased elephant-human conflicts and elephant influenced habitat modification, which adversely affects population numbers of other species.

These countries are looking for ways to reduce their elephant numbers through translocation programs, birth control, and potentially culling.

Today the population is optimistically placed at near 500,000 but census analysis done by the IUCN African Elephant Specialist Group suggests the true numbers are lower.

The group suggests that the estimates are misleading due to several factors influencing census work including the vast forests where elephants inhabit, rampant poaching, political unrest in some of the range countries, and inconsistencies of survey methods.

GIANT PANDA

Genus and species: Ailuropoda melanoleuca

GEOGRAPHIC DISTRIBUTION:

Giant pandas live in a few mountain ranges in central China, in Sichuan, Shaanxi, and Gansu provinces. They once lived in lowland areas, but farming, forest clearing, and other development now restrict giant pandas to the mountains.

Giant pandas live in broadleaf and coniferous forests with a dense understory of bamboo, at elevations between 5,000 and 10,000 feet. Torrential rains or dense mist throughout the year characterizes these forests, often shrouded in heavy clouds.

The giant panda, a black-and-white bear, has a body typical of bears. It has black fur on ears, eye patches, muzzle, legs, and shoulders. The rest of the animal's coat is white. Although scientists do not know why these unusual bears are black and white, some speculate that the bold coloring provides effective camouflage into their shade-dappled snowy and rocky surroundings. The panda's thick, wooly coat keeps it warm in the cool forests of its habitat. Giant pandas have large molar teeth and strong jaw muscles for crushing tough bamboo. Many people find these chunky, lumbering animals to be cute, but giant pandas can be as dangerous as any other bear.

About the size of an American black bear, giant pandas stand between two and three feet tall at the shoulder (on all four legs), and reach four to six feet long. Males are larger than females, weighing up to 250 pounds in the wild. Females rarely reach 220 pounds.

The giant panda is listed as endangered in the World Conservation Union's (IUCN's) Red List of Threatened Species. There are about 1,600 left in the wild. More than 300 pandas live in zoos and breeding centers around the world, mostly in China.

Scientists aren't sure how long giant pandas live in the wild, but they are sure it's shorter than lifespans in zoos. Chinese scientists have reported zoo pandas as old as 35. The National Zoo's Hsing-Hsing died at age 28 in 1999.

A wild giant panda’s diet is almost exclusively (99 percent) bamboo. The balance consists of other grasses and occasional small rodents or musk deer fawns. In zoos, giant pandas eat bamboo, sugar cane, rice gruel, a special high-fiber biscuit, carrots, apples, and sweet potatoes.

Adult giant pandas are generally solitary, but they do communicate periodically through scent marks, calls, and occasional meetings. Offspring stay with their mothers from one and a half to three years.

The giant panda has lived in bamboo forests for several million years. It is a highly specialized animal, with unique adaptations.

FEEDING ADAPTIONS:

Millions of Zoo visitors enjoy watching giant pandas eat. A panda usually eats while sitting upright, in a pose that resembles how humans sit on the floor. This posture leaves the front paws free to grasp bamboo stems with the help of a "pseudo thumb," formed by an elongated and enlarged wrist bone covered with a fleshy pad of skin. The panda also uses its powerful jaws and strong teeth to crush the tough, fibrous bamboo into bits.

A giant panda’s digestive system is more similar to that of a carnivore than an herbivore, and so much of what is eaten is passed as waste. To make up for the inefficient digestion, a panda needs to consume a comparatively large amount of food—from 20 to 40 pounds of bamboo each day—to get all its nutrients. To obtain this much food means that a panda must spend 10 to 16 hours a day foraging and eating. The rest of its time is spent mostly sleeping and resting.

WATER:

Wild giant pandas get much of the water they need from bamboo, a grass whose contents are about half water. (New bamboo shoots are about 90 percent water.) But giant pandas need more water than what bamboo alone can provide. So almost every day wild pandas also drink fresh water from rivers and streams that are fed by melting snowfall in high mountain peaks. The temperate forests of central China where giant pandas live receive about 30 to 40 inches of rain and snow a year. Charleston, West Virginia—a city with a similar temperate climate—receives about the same amount of rain and snow: an average of 42.5 inches a year.

Giant pandas reach breeding maturity between four and eight years of age. They may be reproductive until about age 20. Female pandas ovulate only once a year, in the spring. A short period of two to three days around ovulation is the only time she is able to conceive. Calls and scents draw males and females to each other.

Female giant pandas give birth between 95 and 160 days after mating. Although females may give birth to two young, usually only one survives. Giant panda cubs may stay with their mothers for up to three years before striking out on their own. This means a wild female, at best, can produce young only every other year; in her lifetime, she may successfully raise only five to eight cubs. The giant pandas’ naturally slow breeding rate prevents a population from recovering quickly from illegal hunting, habitat loss, and other human-related causes of mortality.

DEVELOPMENT:

At birth, the cub is helpless, and it takes considerable effort on the mother’s part to raise it. A newborn cub weighs three to five ounces and is about the size of a stick of butter. Pink, hairless, and blind, the cub is 1/900th the size of its mother. Except for a marsupial (such as the kangaroo or opossum), a giant panda baby is the smallest mammal newborn relative to its mother's size.

Cubs do not open their eyes until they are six to eight weeks of age and are not mobile until three months. A cub may nurse for eight to nine months. A cub is nutritionally weaned at one year, but not socially weaned for up to two years. Read more about panda cub develoment.

LIFESTYLE:

A wild panda spends much of its day resting, feeding, and seeking food. Unlike other bears from temperate climates, giant pandas do not hibernate. Until recently, scientists thought giant pandas spent most of their lives alone, with males and females meeting only during the breeding season. Recent studies paint a different picture, in which small groups of pandas share a large territory and sometimes meet outside the breeding season. Much remains to be learned about the secret lives of these elusive animals, and every new discovery helps scientists in their battle to save this species.

Wild pandas live only in remote, mountainous regions in central China. These high bamboo forests are cool and wet—just as pandas like it. They may climb as high as 13,000 feet (3,962 meters) to feed on higher slopes in the summer season.

Pandas are often seen eating in a relaxed sitting posture, with their hind legs stretched out before them. They may appear sedentary, but they are skilled tree-climbers and efficient swimmers.

Giant pandas are solitary. They have a highly developed sense of smell that males use to avoid each other and to find females for mating in the spring. After a five-month pregnancy, females give birth to a cub or two, though they cannot care for both twins. The blind infants weigh only 5 ounces (142 grams) at birth and cannot crawl until they reach three months of age. They are born white, and develop their much loved coloring later.

There are only about 1,000 giant pandas left in the wild. Perhaps 100 pandas live in zoos, where they are always among the most popular attractions. Much of what we know about pandas comes from study of these zoo animals, because their wild cousins are so rare and elusive.

Chameleon

The chameleon is a very distinctive and well-known species of lizard, due to the large eyes and curled tail of the chameleon. Chameleons are found throughout jungle and desert alike, in Africa, Asia and parts of Southern Europe and chameleons have also been introduced to parts of North America.

There are thought to be more than 160 different species of chameleon that range from just an inch to more than a couple of feet in size. The tiny pygmy leaf chameleon, found in the jungles of Madagascar, is the smallest species of chameleon with some males measuring less than 3 cm long.

The largest species of chameleon, the Malagasy giant chameleon, is also natively found in the jungles of Madagascar and can grow to nearly 70 cm in length. Parson's chameleon, also found in Madagascar can grow to around 65 cm in length.

Some species of chameleon, although not all, are able to change the colour of their skin in order to be camouflaged into their surroundings. These colour changes in the chameleon's skin colour can include colours such as pink, blue, red, orange, green, black, brown, light blue, yellow and turquoise, all so that the chameleon can blend in more easily.

The chameleon has exceptional eyesight for a reptile as the structure of the chameleon's eye, allows the chameleon to have complete 360 degree vision around it's body. This special adaptation, allows the chameleon to be able to hunt prey and spot predators more effectively.

The chameleon is generally an omnivorous animal, although some chameleon species are known to have a more carnivorous diet, and other chameleon species prefer to be vegetarians. A chameleon will generally eat anything though including berries, leaves, fruits, insects, worms, snails and some of the larger chameleon species will also hunt small reptiles.

Due to the generally small size of the chameleon, they are often a prime target for hungry predators (when the chameleon can be seen that is). Other tree dwelling animals such as snakes and birds are the most common predators of the chameleon, along with some mammals.

In order to bury to her eggs to keep them safe and warm, the female chameleon firsts digs a hole in the forest floor in which to bury them. The hole can be from 10 to 30 cm deep, but the depth of the hole generally depends on the chameleon species.

The female chameleon then lays a clutch of around 20 eggs, although the exact number of eggs can vary from just one to nearly 100. The chameleon eggs take from 4-12 months to hatch, depending on the chameleon species.

Today many chameleon species are considered to be threatened with extinction, and other chameleon species are even considered to to endangered. The declining chameleon numbers are most likely due to habitat changes such as pollution and deforestation.