(also endangered) for its survival, because it makes its burrows from tortoise burrows, or in the absence of those, oldfield mouse burrows. Non-native species brought in boats by colonizers are the black rat, brown rat and house mouse. Other non-natives are the capybara, the nutria and the Mexican gray squirrel. Shrews and moles Four species of shrews (eulipotyphlans) are found across Florida. Two known subspecies are the Homosassa shrew (Sorex longirostris eionis) and Sherman's short-tailed shrew (Blarina carolinensis shermanii). One of their main predators is the cat. Completing the Eulipotyphla are two species of moles. Sirenia Trichechus manatus latirostris is one of the two subspecies of the West Indian manatee. This herbivorous aquatic mammal lives in rivers, springs and shallow coastal waters. It was designated the state marine mammal in 1975 and is protected by federal and state laws. Threatened by habitat loss, entanglements in fishing gear and crab traps, or by being asphyxiated or crushed by canal locks and flood gates, the most common cause for manatee deaths is being struck by boats, which caused one quarter of all deaths recorded since 1974. In 2015, the statewide population was estimated at 6,063. References General Specific Mammals Florida