Animals feed
Nerve net
Jellyfish swim and respond to their surroundings without a centralized brain. Distributed nerve networks and sensory structures coordinate behavior, so being brainless does not mean being unable to detect or react.
3
Octopuses have three hearts: two supply the gills and one supplies the rest of the body. Their oxygen-carrying protein contains copper and turns blue when oxygenated.
Cubes
Wombats produce distinctly cube-like droppings, shaped inside the intestine rather than by a square opening. Research links the shape to differences in the mechanical properties of the intestinal wall.