We think we've seen every single creature before, but every now and then, there's some discovery of some weird species. Almost as if it were alien life form.

These animal photographs were collected in Ross Piper's new book Animal Earth: The Amazing Diversity of Living Forms, and it showcases a ton of bizarre looking creatures. According to Piper who told Slate:
Most of the time, if you're watching things on television, it's just about mammals or other vertebrates. But that's only a tiny fraction of animal diversity. I want to show people that animals are enormously diverse, not just in how they look but how they live

Sea Slug Chromodoris annulata:


Brush-head:


Segmented Worm: