The natural world is filled with diverse – not to mention quirky and odd – animal behaviors. Consider the male praying mantis that continues to mate after being beheaded; the spiders, insects, and birds that offer gifts of food in return for sex; the...

On dry land, most organisms are confined to the surface, or at most to altitudes of a hundred meters – the height of the tallest trees. In the oceans, though, living space has both vertical and horizontal dimensions: with an average depth of 3800 met...