Creek Chub (Semotilus atromaculatus)
With an architect's heart, many male creek chubs construct a tower of rocks each year. In a way, it's a celebration of spring with the purpose of protecting their unborn progeny. Their work begins at the start of the spawning season when, newly armored with tubercles (horn-like bumps on their noses), they clear a spot on the gravelly bottom of a stream or lake. After a hen chub lays her eggs in the shallow nest and he fertilizes them, Mr. Chub picks up small stones in his mouth and builds his tower over them.