Habitat loss and hunting are among the primary threat factors for the animals on the list.
Life just got better for some 3,000 species of plants and animals that gained protection after a 3.3-million-acre park was approved.
Monkeys that are revolted by often disease-carrying things such as poop suggest that disgust drives cleanliness - and health.
Nicolas, a tufted capuchin monkey, gets help at a primate treatment center.
The smaller the testes in a howler monkey species, the larger the size of the animal's hyoid bone, which enables the monkeys to make booming calls.
The first five monkeys were released in early September, a key moment in a program that has been in the works since 2010.
A hamadryas baboon at an English zoo puts a premium on personal grooming.
China's air force has called monkeys and falcons into service to ensure safe skies for a huge military parade.
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