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Golden lion tamarins are small monkeys, weighing 17 to 24 ounces (482 to 680 grams) and measuring 6 to 10 inches (15 to 25 centimeters) in length with a tail of about 12 to 15 inches (32 to 40 centimeters). Males and females are similar in appearance and size.

Golden lion tamarins live in the heavily populated Atlantic coastal regions of southeastern Brazil. They live in humid forests with many vines, bromeliads, and other epiphytes. They occupy the closed canopy, often remaining 29 to 100 feet (10 to 30 meters) off the ground.

These tamarins are territorial and defend their area with scent markings and vocalized threats. Signs of aggression include an open mouth, an arched back, and staring. Their sleep patterns are regular, meaning that they sleep from dusk until sunrise, oftentimes with a midday nap. Golden lion tamarins sleep in tree holes for warmth and protection fr...

Golden lion tamarins are omnivorous, feeding on fruits, insects, and small invertebrates. Any smaller animal is possible food. They use their long, slender fingers and hands to probe into crevices, bark, bromeliads and other hiding places for their prey. These tamarins share food with their family groups, but rarely share food with others outside t...

Each group has one breeding pair. The breeding season is between September and March, the warmest and wettest time of year. After a gestation period of about four and a half months, the female usually gives birth to twins. Golden lion tamarins are born fully furred with their eyes open. They cling to their mothers for the first few weeks. All membe...

The first year of life is the most difficult for golden lion tamarins; 50 percent of infants die during this time. The remaining individuals usually live for eight years and up to 15 years in human care.