Dylan Dreyer travels to the lowlands of tropical Vietnam to find yellow-cheeked gibbons; meets a rare species of primates once thought to be extinct, the Hatinh langur; and visits the Son Tra primary forest, home to the red-shanked douc.

Dylan Dreyer travels to the volcanic Galapagos Islands to follow 19th century botanist Charles Darwin's trail when he studied the evolution of the islands' plants and animals; she also meets the only lizard in the world that has learned to fish.