With 15 species found around the habitat, howler monkeys are one of the largest New World monkeys and one of a few nest-building monkey species. They emit extremely loud vocal calls (and hence, the name).

Scientific Name – Alouatta

Classification – Alouatta

Gender Names – Male – male; Female – female; Baby – infant

Collective Noun – Troop, cartload

Length/Size – 56-92cm (22-36in)

Weight – 3-9kg (6.6-20lbs)

Top Speed – 30km/h (18mph)

Life Expectancy – 15-20 years

Mating Season – Varies between subspecies

Gestation Period – 180-194 days

Special Features – Spend most of the time sleeping and grooming each other

Social Structure – Move in troops of around 18 individuals

Geographical Distribution – Spread throughout parts of tropical Central and South America

Natural Habitat – South and Central American forests

World Population – Fewer than 2,500 adults (2008)

Diet – Mostly top canopy leaves, together with fruit, buds, flowers, and nuts; also raid bird nests and chicken coops occasionally to consume eggs

Predators – Jaguar, large snakes, birds of prey