Diversity of environments with presence of this species
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The neotropical otter is widely distributes in Mexico, it is present in both slopes of the Sierra Madre Occidental and in the Sierra Madre del Sur on the Pacific side, in the slopes of the Sierra Madre Oriental in the Gulf of Mexico region, and in almost all the Yucatan Peninsula. Neotropical otters inhabit streams, rivers, lakes, mangroves, salt marshes, channels of irrigation and in dams in all the area of the neotropical zone and some regions of the Neartic Zone. It is not present into the Mexican plateau, although sometimes they were common there. It has been registered to them in 21 States (of 32) of the Mexican Republic. This species ocupes many of the diferent riparian ecosystems, from the pino-encino zone (1,700 m) until the mangrove coastal areas (0 m).   
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 Tere are not recent records of the northern otter population (L. c. sonorae) into the mexican portion of the Colorado River, due to the construction of the Hoover Dam and the extensive extraction of fresh water from the Colorado River for big cities as Las Vegas in the United States, which has caused a greater change in the Low Colorado River ecosystem including the delta which passed from a marsh ecosystem to a hypersaline ecosystem. This species is considered extinct in Mexico. There are two records of L. c. lataxina along the Bravo River into the Coahuila State, on 1989 (Gallo, 1997). This subspecies requires of being looked for of one better way and with greater effort in the affluents of the Mexican side of the Bravo River. .
 
The sea otter was distributed historically throughout the coast of the Pacific of the Peninsula of Baja California until Punta Morro Hermoso. It is considered extirpated of Mexican waters since the last registry of its hunting dates from 1912; with exception of a skull observed in 1979 of an individual recently sacrificed in Rancho Nuevo (Baja California, 28°N). Now its present state evidence changes since the observation of individuals of this species has been increased during last the 30 years, perhaps due to the individuals that move of the programs of reintroducción of marine otter in the State of California, particularly in the Island San Nicholas (Gallo-Reynoso and Rathbun, 1997), as the individual observed at the latitude of Magdalena Island (Rodriguez-Jaramillo and Gendron, 1996).
Identification sheet
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