Orangutan (Pongo pygmaeus and Pongo abelii) is a species of great ape native to the rainforests of Borneo and Sumatra. These large primates are known for their reddish-brown fur and long arms, which they use to swing from tree to tree in the dense forest canopy. Orangutans are highly intelligent animals and are capable of using tools to obtain food or build nests. Adult males are much larger than females, weighing up to 100 kg and standing 1.5 meters tall. They are primarily arboreal, meaning they spend most of their time in trees.
Orangutans are solitary creatures, with males and females generally living alone except for mothers caring for their young. Their diet consists mainly of fruit, but they also eat leaves, bark, and insects when fruit is scarce. Sadly, orangutans are critically endangered due to habitat destruction caused by deforestation and illegal logging. Palm oil plantations, in particular, have significantly reduced their natural habitats. Conservation efforts are underway to protect these majestic creatures, but they remain at high risk of extinction.
What is the primary characteristic of orangutans' physical appearance?