There at least six different species. They are the noisiest animal in creation and they can be heard up to a mile away. The Howler is about 2-3 feet in length and weighs about 15 pounds.
Males are usually larger than females.
Their life span is about 20 years. Howler monkeys have a prehensile tail. Their colors can vary from reddish to brownish to blackish. They live in groups of 4 - 20 or more members depending on the species. Howlers are good swimmers.