After a trial injection of an experimental drug into a group of monkeys, an observer watches the various participants’ unusual and often deadly responses.

Jim's years of experience as a zookeeper and guard haven't prepared him for the boy who climbs into the lion's den - or the animals' unnatural behavior afterwards.

A researcher and his assistant conduct neuropsychological experiments on dogs with the understanding that the dogs will be terminated immediately after, but the reality of their killing is much more difficult to cope with.

When a pair of scientists studying the Badlands observe strange behavior in nearby animals, they too begin to fall under an evil influence that turns them against each other.

A man intently studies extinct mammals to escape his wife and mistress, who often vent to him about their daily worries and give him anxiety.

A boy finds a mysterious caterpillar-like creature in the forest one day. He brings it home and kills it to add to his wildlife collection, but becomes haunted by creatures he can no longer control.

A zookeeper describes an incident at the zoo that leaves all of the animals behaving strangely and becoming self-aware.

When a man shoots an owl that has been taking his chickens and the owl does not die, the man decides to keep the animal alive and let it suffer—only to be mocked and outsmarted by the bird.

A Japanese primate sociologist's life falls apart in slow-motion as he struggles with research, tension in his marriage, and his declining health.

After a mysterious plague causes humans and animals to give birth to mutated creatures, a zookeeper and his mutated daughter struggle to keep their traveling zoo show in business.