Crista Zarafa display of "normal" skin behavior by day while simultaneously showing what occurs at night. The bioluminescence of its body blends with the bioluminescence of it’s surroundings making it seamlessly blend into its environment.
Predatory rats hunt a rabbuck. From the book After Man, by Dougal Dixon. Speculative biology or evolution is a fascinating offshoot of both paleontology and paleoart especially when it pertains to how possible future organisms might look and live.