Examples include guppies, mollies, moonfish, platys, four-eyed fish and swordtails. This is the same family that includes familiar aquarium fishes such as guppies and mollies. The cichlid acts aggressively toward native Largemouth bass, Western mosquitofish, sailfin mollies, and blue crabs. Fish that have live-bearing offspring include the guppy and mollies or "Poecilia". Depending upon environmental conditions, sailfin mollies may become reproductive in less than a year. Male mules (johns) are sterile, but fertile female mules (mollies) sometimes occur. All-female species include the Texas silverside, "Menidia clarkhubbsi" and a complex of Mexican mollies. The male mollies generally tend to be mildly aggressive. Midnight mollies actually originated from hybrids between that and the present species. Pinkerton Detective James McParland was employed to infiltrate the Mollies. A woman, the wife of one of the reputed Mollies, was shot dead. British and Irish newspapers reported about the Mollies in Ireland in the nineteenth century. The song has recently been covered by the Missouri band The Cotton Mollies. Unlike the Mollies, the WFM's union leadership was acquitted. The victims had been secretly identified by McParland as Mollies.