Least Killifish - Heterandria formosa
(Originally published in American Currents Summer 2012 by Thomas P. Ganley)
This species is another outstanding little fish from the southeastern United States. The females are barely one-inch long and the males are usually a third that size. Lively, sociable, and easy to keep, it eats anything, adapts easily to most water types, and constantly breeds. The Least Killifish is one of the two smallest vertebrate animals in the United States. Actually, the male may be the smallest vertebrate animal in the entire word.
