31. When a spider monkey sees a human approaching, it barks loudly similar to a dog. 32. The area is home to some 70 animal species, including jaguars, spider monkeys and tapirs. 33. This name was given due to the abundance of spider monkeys that inhabited this area. 34. Brown spider monkeys are known to shake branches in order to ward off potential predators. 35. Geoffroy's spider monkey lives in fission fusion societies that contain between 20 and 42 members. 36. A few spider monkeys played in one caged area. 37. Spider monkeys are susceptible to malaria and are used in laboratory studies of the disease.38. Peruvian spider monkey are independent at about 10 months, with a lifespan of about 20 years. 39. The black-headed spider monkey is arboreal and diurnal. 40. Recent meta-analyses on primate cognition studies indicated spider monkeys are the most intelligent New World monkeys.
