A black howler monkey wakes up to a new day in the Pantanal of Brazil.

I was in a canoe,  first thing in the morning in the Pantanal of Brazil when I saw this black howler monkey just waking up. Anyone who has been to an area inhabited by howler monkeys has probably heard their unmistakeable call — the alarm clock of the rain forest —  which can sometimes sound like a jet taking off. The attached sound file is a bit mellower than some I’ve heard, but gives an idea of what they sound like.

Howler Monkey