The three black howler monkeys, two Geoffrey’s spider monkeys (Ateles geoffroyi) and a margay (Leopardus wiedii) — all classified as endangered in Guatemala — were among the 26 animals released.

Black howler monkeys (Alouatta pigra) comb the forests of Mexico, Belize and Guatemala in search of fruit and edible vegetation, so Miguel de Guinea (Oxford Brookes University, UK), ...

The Yucatán black howler monkey has been listed as an endangered species since 2003. Since 1978, they declined by more than 60% because of hunting, habitat loss and disease, all of which continue.