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With a name as pretty as Gynaephora groenlandica, you’d imagine this moth to be a frail creature with no defenses at all. But it is one of the hardiest insects in the world, surviving the Arctic winter frozen and still alive as a caterpillar. The Arctic woolly bear is a true survivor in every sense of the word and has even wormed its way into our culture.

A pelagic lifestyle is rarely found in marine gastropods, but the sea butterflies have evolved to swim in open ocean. These highly specialized snails play a big part in understanding the acidification of Earth’s oceans.

The so-called “buzzsaw shark” Helicoprion was a prominent feature of the oceans roughly 290 to 250 million years ago. Known mostly for its strange spiral set of teeth, it was also a titanic marine monster that sometimes stretched more than 12 meters in length and was the biggest marine animal of its day.