Evan celebrates his birthday by trekking to Sri Lanka in search of one of the coolest mammals on the planet, the slender loris. He also meets a very special three-legged elephant, a rare tree pit viper, and works with orphaned thick-tailed pangolins.

Evan heads to the Amazon in Peru to help release a family of howler monkeys back into the wild; a baby spider monkey is injured after falling from a tree; a tapir and a short-eared dog are examined.