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Tree-kangaroo

life science Maturity 5-7 Next article →

Tree-kangaroos are specialized marsupials belonging to the genus Dendrolagus. They are unique because they are the only true arboreal macropods. This means they have adapted specifically for life in the trees. Most species live within the tropical rainforests of New Guinea. You can also find them in the islands of the region. Some populations live in far northeastern Queensland, Australia. They thrive in the forest canopy rather than on the ground.

Dendrolague
Dendrolague

To survive in the treetops, these animals have developed several physical adaptations. Their hind feet are much broader than those of terrestrial kangaroos. They also possess longer and more curved nails for gripping bark. The soles of their feet have a sponge-like grip. A large, pendulous tail provides enhanced balance during movement.

WPZ - Matschie's Tree Kangaroo 03
WPZ - Matschie's Tree Kangaroo 03

Moving through the forest involves a specific sequence of actions. When climbing, a tree-kangaroo wraps its forelimbs around a tree trunk. It allows the forelimbs to slide while it hops upward. This upward movement is powered by its strong hind legs. They are also expert leapers in the canopy. They can jump downward from one tree to another. They can even jump from heights of 15 meters to the ground without injury.

Bennett's Tree-kangaroo mother & baby
Bennett's Tree-kangaroo mother & baby

On the ground, their movement is quite different. They are considered slow and clumsy when they are not in trees. They move at approximately a human walking pace. They hop awkwardly by leaning their bodies far forward. This posture helps them balance their heavy tails while moving. To stay cool, they use a method called behavioural thermoregulation. Since they do not sweat, they lick their forearms to allow moisture to evaporate.

Lumholtz's tree-kangaroo
Lumholtz's tree-kangaroo

The evolutionary history of these animals is a complex process. Scientists believe they may have descended from a pademelon-like ancestor. This ancestor likely lived on the rainforest floor. During the late Eocene, the Australian and New Guinean continents began to dry. This caused rainforests to retreat. Ancestral pademelons then moved into drier, rockier environments. They may have evolved into rock-wallabies with generalist feeding strategies.

Grizzled Tree Kangaroo area
Grizzled Tree Kangaroo area

During the mid-Miocene, rock-wallabies adapted to new rainforest types from Asia. Some of these animals began spending more time climbing trees. By the Late Miocene, these semi-arboreal animals may have evolved into the extinct genus Bohra. Global cooling during the Pleistocene caused further drying and rainforest contraction. This isolated populations of Bohra into small, diverse rainforest fragments. These isolated groups eventually specialized into the modern Dendrolagus species.

Macropodidae - Dendrolagus dorianus
Macropodidae - Dendrolagus dorianus

There is significant variety in size and species among tree-kangaroos. Lumholtz's tree-kangaroo is the smallest species. An adult male of this species weighs about 7.2 kg. In contrast, the grizzled tree-kangaroo is much larger. Its males can weigh between 8 and 15 kg. Matschie's tree-kangaroo males weigh between 9 and 11 kg. The extinct D. noibano was even larger than any living species.

Tenkile area
Tenkile area

Reproduction in tree-kangaroos is a slow and careful process. Females reach sexual maturity at approximately 2.04 years of age. Males take longer, reaching maturity at 4.6 years. They have a very long offspring maturation period. A joey stays in the pouch for 246 to 275 days. Weaning occurs anywhere from 87 to 240 days after that.

Dendrolagus goodfellowi -Melbourne Zoo, Australia-8a
Dendrolagus goodfellowi -Melbourne Zoo, Australia-8a

Today, many tree-kangaroo species face serious threats. Habitat destruction is a primary concern for their survival. Logging and timber production destroy their homes. They also lose habitat to coffee, rice, and wheat production. Hunting by local communities also causes population declines. These changes make them more vulnerable to predators. The amethystine python is a natural predator that climbs into the trees. Feral domestic dogs also pose a threat in fragmented habitats.

Dendrolagus notatus 249639440
Dendrolagus notatus 249639440
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🖼️ Images & Media (23)
File:Goodfellow's_tree-kangaroo_at_Currumbin_Wildlife_Sancturary,_Queensland,_Australia.jpg
Goodfellow's_tree-kangaroo_at_Currumbin_Wi...
File:Dendrolague.jpg
Dendrolague.jpg
File:Grizzled Tree Kangaroo area.png
Grizzled Tree Kangaroo area.png
File:Lumholtz's tree-kangaroo.jpg
Lumholtz's tree-kangaroo.jpg
File:Lumholtz's Tree Kangaroo area.png
Lumholtz's Tree Kangaroo area.png
File:Bennett's Tree-kangaroo mother & baby.jpg
Bennett's Tree-kangaroo mother & baby.jpg
File:Bennett's Tree Kangaroo area.png
Bennett's Tree Kangaroo area.png
File:Dendrolagus ursinus Gould.jpg
Dendrolagus ursinus Gould.jpg
File:Ursine Tree Kangaroo area.png
Ursine Tree Kangaroo area.png
File:WPZ - Matschie's Tree Kangaroo 03.jpg
WPZ - Matschie's Tree Kangaroo 03.jpg
File:Matschie's Tree Kangaroo area.png
Matschie's Tree Kangaroo area.png
File:Macropodidae - Dendrolagus dorianus.JPG
Macropodidae - Dendrolagus dorianus.JPG

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