Mammals vary in size from the 100-foot-long blue whale to the two-gram bumblebee bat, one of the world's most endangered species. Most mammals measure less than one foot (including the head and body). That makes small mammals far more common, if less well known, than large mammals like elephants, tigers, and people.
Small mammals cut across categories. Most species are rodents (such as the naked mole-rat), insectivores, and bats, but there are also carnivores (such as slender-tailed meerkats and striped skunks), and primates (such as golden lion tamarins and lemurs).
Family members of this species greet with what looks like a kiss. They're not really kissing, but gently touching their front teeth together. What animals recognize each other this way?
For more than 30 years, this program has been saving these small monkeys through conservation breeding and reintroduction to their natural habitat in Brazil. Thanks to the success of the program, the status of GLTs was downgraded from "critically endangered" to "endangered" by the World Conservation Union (IUCN) in 2003. more