The eucalyptus leaf is a delicacy of koalas (koalas). The detailed introduction is as follows:

1. Animal introduction:

The koala is Koalas are animals of the family Diprotodontidae. The koalas have a stout body, a big head, round ears, and no tail. They have a large and exposed nose. They are spoon-shaped and have thick coats. The color of the back hair ranges from light gray to chocolate, and the belly hair is The koala has small white eyes and the mouth of the pouch is controlled by sphincter muscles to prevent the cub from falling. The koala is named after its appearance like a small bear.

Koalas are endemic to Australia and are distributed in southeastern Queensland, eastern New South Wales, southeastern South Australia and Victoria. Koalas inhabit open eucalyptus forests and spend most of their lives in eucalyptus trees. Koalas sleep 17 to 20 hours a day, are nocturnal and slow-moving, and mark their territory by leaving excrement at the base of trees.

The threat to koalas reached its peak in 1924, when more than 2 million koala skins were exported. Prior to this, koalas had become extinct in southern Australia and in Victoria and New South Wales. It also basically disappeared. After that, the local government began to issue a hunting ban and strengthen management, and the decline trend was reversed.

2. Morphological characteristics:

Koalas have relatively small brains, which may also be an adaptation to their low-energy food. The brain is an energy-intensive organ that consumes a disproportionately large portion of the body's total energy budget. The relative brain size of the koala is almost the smallest of any marsupial found. The average weight of a koala brain found in southern Australia is only about 17 grams.

Relative to its body size, the koala's cecum is the longest among all mammals, reaching 1.8 to 2.5 meters long, three times its body length or even longer. The jaws have been reduced to 1 premolar and 4 wide and high-cusped molars. The male koala weighs 50% more than the female, has a relatively broad face, and a pair of relatively small ears.

3. Living habits:

Koalas spend most of their time in trees, and almost their entire lives in eucalyptus trees. It spends much of its day sleeping, less than 10% of its time foraging, and the rest of its time is spent mainly sitting still. Koalas have been climbing trees since they were young. When they get down from a tree, they always go backwards, butt first and move very slowly.

Koalas have made numerous adaptations to arboreal life. Since they use neither dens nor cover, their tailless, bear-like bodies are covered with a dense layer of hair that provides good insulation. Koalas have extremely incurved, needle-like nails on most of their toes, making them highly skilled climbers.