Animals feed
2007
Some dried tardigrades survived experimental exposure to space on the 2007 Foton-M3 mission. Survival depended strongly on exposure conditions, especially whether the animals received solar ultraviolet radiation.
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.