I am a crab and I have evolved at least five separate times, but no one knows why

Underwater scene with migrating crabs and other small marine creatures among colorful coral reefs

We are present around the world, in every ocean, in some lakes, even on dry land.  We are an old, proud order having shared the world with the dinosaurs 200 million years ago, but some of us aren’t even true crabs. They are imposters that have evolved separately, over and over again. I am a… Continue reading I am a crab and I have evolved at least five separate times, but no one knows why