What typically causes the common name 'crabeater seal' to be considered a misnomer?

Answer

Because crabs constitute a negligible portion of their actual diet

The name is a misnomer because the reality of their menu, consisting overwhelmingly of krill, is far removed from large, shelled crustaceans, with crabs comprising less than one percent of their intake.

What typically causes the common name 'crabeater seal' to be considered a misnomer?
animalmammalsealCarnivore