Mantis shrimp have awesome eyes. In addition to seeing color way better than humans can, they can also detect the various polarizations of light. Because of the way that vast quantity of data is processed it isn't quite as awesome as it at first seems, but the processing is itself worthy of praise insofar as we understand it.
Octopuses do a large amount of thinking outside of their brains. Decentralized nervous system for the win. Some also put chameleons to shame: they change not just their color but also their shape and texture.
Woodpeckers heads are designed to withstand the impact of repeatedly smashing their heads into solid objects.
Some species of birds can dance (not just move, dance) so fast that, without high speed cameras capturing the motion and slowing it down A LOT they appear to simply teleport between the spots where they pause in their dance.
The point, in general, is that there are some pretty awesome things in nature.
I want to write something (which plays fast and loose with actual science) with a genetically engineered character whose abilities are an amalgam of those found in nature. (Why not have photosynthesis?)
I'd like it if readers would share some things I could work in, or just neat stuff even if I wouldn't be able to fit it into the character.