Why don't polar bears eat penguins?

This was an extra credit question asked on my Coastal and Marine Science exam. It is a simple question with a simple answer, but you'd be amazed how many people didn't get the extra points.

The answer? Polar bears occur in the Arctic or northern hemisphere while all 17 species of penguins evolved in the southern hemisphere.

But as everyone in the UK knows, the real reason polar bears don't eat penguins is because their paws are too big to get the wrappers off

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For the geographically disadvantaged, penguins are individually wrapped chocolate biscuits that are almost, but not quite, as delicious as Tim Tams