Distribution of the Neotropical River Otter (Lutra longicaudis annectens Major, 1897) in the Rio Yaqui, Sonora, Mexico

Until now, there have only been four records of otters from Sonora state, Mexico. This study reports on a survey of the Rio Yaqui for otters and bald eagles. 42 locations with otters were found, and direct observations made, as well as finding latrines, footprints etc. The otters are mainly piscivorous unlike the crustacean eaters in other parts of Mexico. Otter abundance was calculated at 0.34 otters per km.