Animals feed
Porifera
Sponges are animals that usually remain attached to a surface as adults, drawing water through porous bodies to obtain food. They belong to the phylum Porifera and lack a brain, nerves, and familiar internal organs.
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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.