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Common brushtail possum

life science Maturity 5-7 Next article →

The common brushtail possum is a nocturnal, semiarboreal marsupial. This means it is active at night and spends much of its time in trees. It belongs to the family Phalangeridae. It is the second-largest of the Australasian possums.

Trichosurus vulpecula skeleton
Trichosurus vulpecula skeleton

While native to Australia, it has also become an invasive species in New Zealand. This animal is quite adaptable to different environments. It can live in forests, semi-arid areas, and even busy urban cities. Because they thrive near humans, they are often the most common marsupial seen by city dwellers.

Physically, the brushtail possum has several specialized features for life in the trees. Its name comes from its large, bushy tail. This tail is prehensile, meaning it can grasp branches. The underside of the tail has a naked, hairless patch to improve grip.

Trichosurus vulpecula skeleton
Trichosurus vulpecula skeleton

Their fore feet have sharp claws for climbing. On their hind feet, the first toe is clawless but provides a strong grasp. They use their third and fourth toes, which are fused together, to groom their thick, woolly pelage. This fur can appear in colors like silver-grey, brown, black, red, or cream. Males are generally larger than females and often have reddish fur at their shoulders.

Dietary habits of the brushtail possum are quite flexible. They are largely omnivorous, meaning they eat both plants and animals. While they prefer Eucalyptus leaves, they rarely eat only one thing. They also consume flowers, shoots, fruits, seeds, insects, and birds' eggs. They have even been known to eat small mammals like rats.

Baby common brushtail no 1
Baby common brushtail no 1

Their rounded molars are designed for crushing food rather than cutting it finely. This allows them to process fruit and herbs effectively. Unlike the koala, which specializes in one plant, the brushtail possum eats many different species during a single foraging trip.

In Australia, the species has a massive range. It lives in the eastern and northern parts of the continent, Tasmania, and offshore islands. Different indigenous groups have specific names for local populations. For example, in the Kimberley, they are called nunguin. In the Pilbara, they are known as walambari. In the desert, they are called wayurta. However, their distribution is changing. Drought, disease, and invasive mammals have affected their habitat. In the Northern Territory, one study found a 50% reduction in the breadth of the environmental space they occupy. They seem to be moving toward areas with higher rainfall and more vegetation.

Reproduction in brushtail possums follows the typical marsupial pattern. Females have a forward-opening pouch to protect their young. After a gestation period of 16 to 18 days, a single tiny newborn is born. The newborn must climb through the mother's fur to reach the pouch. It stays inside for 4 to 5 months to develop.

Baby common brushtail no 1
Baby common brushtail no 1

Once older, the young may ride on the mother's back until they are 7 to 9 months old. Females reach sexual maturity at one year, while males reach it at the end of their second year. In the wild, these animals can live for up to 13 years.

History shows how the species moved to New Zealand. European settlers introduced them in the 1850s to start a fur industry. Without many natural predators, the population exploded. In New Zealand, they became a major agricultural and conservation pest. By the 1980s, the population reached an estimated 60 to 70 million. Today, that number is down to about 30 million due to control measures.

Brushtail possum exudative dermatitis
Brushtail possum exudative dermatitis

One major difference is disease. In New Zealand, possums can carry bovine tuberculosis, which is not an issue in Australia.

Because of their impact on forests and gardens, humans have different relationships with them. In Australia, they are largely protected, though they can be trapped to remove them from houses. In New Zealand, they are managed heavily to protect native birds. In some places, they are even hunted for meat and fur.

Brushtail possum exudative dermatitis
Brushtail possum exudative dermatitis

However, overcrowding can cause health issues. For example, stress from competition for dens can lead to a condition called exudative dermatitis. This shows how closely their survival is tied to the availability of safe places to live.

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File:Trichosurus vulpecula skeleton.jpg
Trichosurus vulpecula skeleton.jpg
File:Brushtail possum exudative dermatitis.jpg
Brushtail possum exudative dermatitis.jpg
File:Baby common brushtail no 1.JPG
Baby common brushtail no 1.JPG
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