Monkeys Starting with I

(Leontocebus illigeri) is a species of saddleback tamarin, a type of small monkey native to South America. Illiger's saddleback tamarin is native to the Peruvian Amazon, and its type locality is in Loreto, Peru, on the left bank of the lower Ucayali River.

The Indochinese black langur (Trachypithecus selbstus) is a little-known Lutung endemic to Laos and neighboring Vietnam. Because they live in dense forests and rarely venture outside, observing them in the wild can be difficult.

The Indochinese gray langur (Trachypithecus crepusculus) is a species of Lutung native to Southeast and East Asia. This species was once thought to be conspecific with the Phayre's leaf monkey (Trachypithecus phayrei).

Isabel's Saki (Pithecia isabela) is a New World monkey species, native to a small part of northern Peru. The species was named in honor of Isabel Godin des Odonais, an 18th-century Ecuadorian noblewoman who traveled across South America to find her husband.