The animals form a kingdom with more than one million species. However, the fossils found indicate that a much higher number of animal species have inhabited the planet, but are currently extinct. The reasons for the deaths are adverse, but some live much less than you can imagine.This selection highlights the 10 Animals With Shorter Life Span In The World. Some of these creatures may not even characterize surprise to some people. While size is not really a determining factor in relation to the duration of life, these animals are also very small.