Black Bear https://kids.nationalgeographic.com/animals/mammals/facts/black-bear
Balanced on a rock in the middle of a river, a black bear lowers her head to the water and … chomp! A wriggling salmon is no match for her strong jaws. She’s spent the summer eating berries and roots—now she’s eating all the salmon she can catch to gain as much weight as possible. She needs enough stored fat for her body to make milk for newborn cubs this winter.
they live off the huge amounts of body fat they stored up during the summer and fall