Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...

Scientists have detected microplastics in the digestive systems of red howler monkeys living in protected areas in the Brazilian Amazon, marking the first evidence of plastic ingestion by a ...

An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...

A new study revealed the presence of microplastics in the stomachs of howler monkeys living in a protected area of the Brazilian Amazon. This is the first evidence of plastic ingestion by a ...

On an island in Panama, a fad that one researcher called "viscerally disturbing" has recently taken off among a group of young male monkeys. These adolescents and juveniles have started to kidnap the ...

JICARÓN ISLAND, Panama, May 20, 2025 — White-faced capuchin monkeys on Jicarón Island, part of Coiba National Park off Panama’s Pacific coast, have been observed carrying infant howler monkeys, a ...

A group of male capuchin monkeys kidnapped baby howler monkeys – a different species – on a small island of Panama. Video shows the howler monkeys clinging to the male capuchin monkeys’ backs, but the ...