No - most ferns contain toxic substances and contain very little nutrition because as simple plants they do not store much food in their tissues. An exception are the "fiddleheads" - first leaves that some ferns sprout in the spring and which some people eat. They which are bitter (contain some chemicals) but are still edible as they have not yet grown enough to produce more of the substances.
a puma would eat a black bear.
An Asian black bear, yes. American black bear, no.
Grizzly bears can and will kill black bears to claim for territory, but would not necessarily eat them.
No, and unless the bear was severely injured the eagle would not even attack.
black bear maybe do eat river otter
Black bear eats cranberries.
Yes, if the asiatic black bear can catch the vulture.
can muslims eat black bear
everything
other types of bears such as the grizzly/brown bear eat black bears
Humans eat black bears.
Wolf, if the bear is hungry.