More than 50% of Cuba plants and animals are unique to the island. Originally in the Pacific Ocean, the landmass that became Cuba was brought into the Caribbean by continental drift. As it did, an astonishing variety of life arrived, including:he world smallest bird, the bee hummingbird, at 2.24 in, including bill and tail.he Northern Hempisphere smallest frog, the eleutherodactylus frog.he Cuban Leaping Crocodile, the most aggressive crocodile species known, which can leap from the water to grab small animals from overhanging branches.