When I would be a shark and came across a whale, no matter its size, I would bite off its fins and start eating. Same with a big ray. How do those animals survive so long anyway?
In: Biology
One fling with a fin or abrupt movement, they are dead. Why risk it? (Evolutionarily speaking, the individual has no such knowledge)
Sharks are quite delicate creatures and demand quite a specific diet, there is a great video for ELI5:
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