When consuming larger, vertebrate prey, which animals have walruses been reported preying upon?

Answer

Seals and young whales

Reports exist of walruses preying on seals, including smaller species like ringed seals, and documented instances of them taking young whales, such as belugas or bowhead whale calves.

When consuming larger, vertebrate prey, which animals have walruses been reported preying upon?
dietanimalmammalwalrus