What animal species have no specimens in zoos?

Many! There are many thousands of species that are not found in zoos. But one of the most visible examples is the mountain gorilla. Almost all the gorillas you will see in (at least US) zoos are western lowland gorillas. read more

Almost all the gorillas you will see in (at least US) zoos are western lowland gorillas. There are a smattering of eastern lowland gorillas. But mountain gorillas (these are the Gorillas in the Mist gorillas) cannot live in zoos, so there are none in human care. Most zoos participate in fundraising for conservation efforts to protect them, though. read more

Emu The 10th most common species in zoos is a bird, the emu (Dromaius novaehollandiae). At least 306 zoos exhibit these birds around the globe. In addition, a lot of private keepers also have some of them among poultry. read more

Supposedly, the animal was born in the zoo. Then it should have no cravings for freedom. However if the animal was caught and put into the zoo, it might want to run away and return to its homeland. read more