Yes. Here's a definition:den: a cave. Dinosaurs sleep in dens.
To keep warm.
Yes they do.
Beavers create little dens where they sleep and hibernate.
No, they sleep in dens which may be covered with snow.
No they only sleep in trees
Porcupines typically sleep in dens or burrows in the wild.
Yes they only sleep in trees they do not have dens tree holes or a nest
Raccoons do not hibernate. during severe winter weather they will stay in their dens and sleep until the conditions improve. However, it is not a true hibernation.
American black bears spend much of the winter dormant, but scientists do not consider them true hibernators, because they frequently awaken from deep sleep to leave their winter dens for short periods. Their dens may be caves; hollow, standing or fallen trees; or burrows.
Bears do not really hibernate. They will fall into a deep sleep, but vital signs remain near normal. They sleep in dens they find or dig themselves. Females give birth in these dens over winter.
Coyotes sleep most of the day in their dens, and they come out to hunt at night.