they need to build their housed .
No, but they eat alot before hibernating
That is the correct spelling of "hibernating" (seasonal inactivity).
The suffix in the word "hibernating" is "-ing."
The plural of otter is otters.
Neither. Not all animals need to be migratory or hibernating.
No, male otters do not drown female otters during mating.
Tenning is hibernating
No, it does not.
There are sea otters and other otters. In the category of "other" otters, you can include the North American River Otter, Giant Otter of South America, Asian small clawed otters, Congo clawless otters, Capr clawless otters, Southern river otters, hairy nosed otters, spot necked otters, neo tropical long tailed otters, and others I may fail to mention.
Otters
Otters.
mostly river otters, sea otters and other types of otters.