proboscis monkey (Nasalis larvatus)

Why did the Bronx Zoo stop keeping proboscis monkeys? (The Bronx Zoo was likely the last zoo in the United States to keep proboscis monkeys.)

@captain alligator they weren't having success in rearing young and maintaining them long-term. Meanwhile, Southeast Asian zoos have done well with establishing a long-term zoo population. The decision was ultimately made to send them to Singapore Zoo to be of use to a larger breeding group.

~Thylo