orangutang

例句：

1. 1. The orangutan is one of the rarest and most endangered primates in the world.
   红毛猩猩是世界上最稀有和最濒危的灵长类动物之一。
2. 2.They conducted a study on the behavior of orangutans in their natural habitat.
   他们进行了一项关于红毛猩猩在自然栖息地行为的研究。
3. 3. The orangutan population has been declining due to habitat loss and poaching.
   由于栖息地丧失和偷猎，红毛猩猩的种群数量一直在下降。