Animals feed
Prints
Koalas have fingertip ridge patterns strikingly similar to human fingerprints. Claims that koala prints have actually confused crime-scene investigators are not supported by documented cases in the sources reviewed.
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.