River otters do not dig their own dens but may modify the unused burrows of other mammals. Otters also dwell in abandoned beaver lodges, hollow logs, under tangles of roots, and within rocky ledges.

Dolphins are important indicators for the health of the rivers they live in, which are also the lifeblood of huge economies and hundreds of millions of people. WE DEPEND ON RIVER DOLPHINS Where ...

Both aquatic weeds are native to South America and can form dense mats that deplete nutrients and resources from bodies of ...