Social system - Comparatively little information exists about the mating system and social organization of the river otter. The female-young or family group comprises the basic social unit. After the ...

The otter of the hour. The Asian small-clawed otter (Aonyx cinereus) is the smallest otter species on the planet, weighing only 2.7 to 3.5 kilograms.Its short claws, which give it its name, make ...

You could see some otter mothers – distinguishable due to nose scars incurred during mating – demonstrate behaviors to pups, including grooming and cracking clam shells.

Only two otter species, sea otters and North American river otters, can be found in the U.S. Otters thrive in a variety of habitats, but most species inhabit freshwater rivers, lakes, and wetlands.

Sea otters in Ollie's situation have been known to accost birds, river otters and seal pups, Watson said. Cameron said she's even aware of a sea otter attacking a dog in this way.