When a courageous and curious bear ventured up a tree, he had no idea he'd win the Internet last September. The hilarious photo of a big brown bear falling onto a mattress-like pad produced meme after meme, until everyone on the Web was talking about him. However, the actual situation was no laughing matter — the bear had been tranquilized and dropped onto a cushion to be removed. Still, he became one of the most memorable animals of 2012.
50 Best Animal Pictures of 2012countdown
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