are considerably more vulnerable when they travel overland between
lakes, ponds, and steams . Bobcats (Felis rufus), dogs (Canis
familiaris), coyotes (C. lutrans), foxes, gray wolves (C. lupus), and
American alligators (Alligator mississippiensis) have all been reported
to kill northern river otters [4,14,15]. In addition, it is likely that other
predators, including cougars (F. concolor), black bears (Ursus
americanus), American crocodiles (Crocodylus acutus), and some large
raptors, also kill northern river otters on occasion. No predator has been shown
to have a serious impact on northern river otter populations, and most predation
is probably directed toward young northern river otters .
- 4. Chapman, Joseph A.; Feldhamer, George A., eds. 1982. Wild mammals of North America. Baltimore, MD: The Johns Hopkins University Press. 1147 p. 
- 14. Melquist, Wayne E.; Hornocker, Maurice G. 1983. Ecology of river otters in west central Idaho. Wildlife Monographs. 83: 1-60. 
- 15. Route, William T.; Peterson, Rolf O. 1991. An incident of wolf, Canis lupus, predation on a river otter, Lutra canadensis, in Minnesota. Canadian Field-Naturalist. 105(4): 567-568. 
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