(n.) A species is a “kind” of living organism, different from other species of organisms. There is no single definition of species that applies to or works for all types of organisms. The definition of a species in plants is different from the definition of a species in animals, and both are different from the definition of species in microorganisms. In animals, one definition of species works well for some organisms, while the same definition may not work as well for other groups of organisms. Some species are easy to tell apart, like Mourning Doves and White-winged Doves, while others, like many insects, are more difficult.