Man is the only predator to a bear when it is an adult. Unless it dies from a fight or old age/sickness, then it can be eaten by all forest meat eating dwellers.
No bear eats eucalyptus leaves. The koala is a marsupial, not a bear, which eats eucalyptus leaves.
Jaguars are known to prey on adult spectacled bears from ambush. Mountain lions kill and eat unprotected spectacled bear cubs.
Mountain lions are generally the apex predator in their habitats but occasionally will have a confrontation with a black bear, a grizzly bear, a wolf pack or a jaguar.
None, No polar bear eats pizza
A bear eats a coyote
A polar bear
the person shoots the bear and eats it
another bear.
a bear
another bear.
The bear eats birds.
No animals (besides humans) eat adult bears, however bear cubs are preyed upon by animals like cougars, bobcats, and coyotes.