Cross dressing fish!

The bluegill sunfish (Lepomis macrochirus)
What do sneakers and satellites have to do with fish? Although the bluegill sunfish is very common to the Great Lakes region, its reproductive strategies are not so common and have been the focus of many scientific studies. During mating, large, dominant males defend a nest to attract a female, while small "sneaker" males hide nearby. When until a female enters the nest of a dominant male he rushes in, discharging sperm as the eggs are released, in an attempt to gain fertilizations. "Satellite" males actually resemble females and attempt to join a mating pair in a nest to obtain fertilizations. Such alternative reproductive strategies have been described in other sunfish and in fish species of other families.