Cracked has a really funny piece called "5 Species That Seem to be Trying to Take over the Earth" that has a video that blew me away. I've spent some time on boats and have been lucky enough to watch dolphins play around, up close and personal, but didn't know they traveled in such huge groups.
You can thank global warming for #4 on the list -- Jellyfish. Warmer oceans = more killer jellyfish.
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Thumbnail photo: Cheetah100/Flickr