Animals feed
Cooling ears
Elephant ears are living heat exchangers: blood carries body heat into a broad network of vessels near the surface. Flapping moves air across the ears and helps that heat escape.
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.