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WATER MAN said...
If I was a gambler, I would be putting $20 on the shark and a $5 each way on the temp/white bait theory.
Well the two don't have to be mutually exclusive. If the penguins are having to swim further and spend more time in the water to get their quote of bait fish then naturally they are increasing their own exposure to predation, from both sharks and seals.
EDIT:
Aww, red thumbs for stating a fact. Good old sb.