The smallest New World primate, also the smallest monkey, weighs less than five ounces (the only smaller primates are several Madagascan lemurs). Pygmy marmosets occupy a rather large range in the forests of Western South America. Formerly rather rare in zoos, its captive population is now well managed with more than 700 world-wide, mostly captive-bred. It is usual for twins to be born. Despite their tiny size, they can live 20 years in captivity. In the wild, they specialize in eating gummy sap. In captivity, they do quite well on the same diets that larger marmosets and tamarins receive: a manufactured primate diet, fresh fruits and vegetables, and insects.
Distant relatives of elephants and hyraxes, West Indian manatees occur in two subspecies. The Antillean manatee of Central and South America, and various Caribbean islands, is almost identical to the Florida manatee (T. manatus laterostris), being slightly smaller with a narrower skull.
Until 2001, when the Giant huntsman spider was discovered in Laos, this enormous tarantula of the Northern South American rainforests was known as the largest spider in the world, and is still the heaviest. The legs may span one foot and they can weigh up to six ounces. While it is certainly capable of eating small birds, their more usual prey is insects, frogs, and lizards. Their venom is comparable to that of a wasp, but they are also capable of damaging human skin with their detachable irritating hairs. Females can live to be 25 years old and males only to six.