  Animals have evolved distinctive survival strategies in response to constant
selective pressure. In this review, we highlight how animals exploit complex
flow phenomena by manipulating their habitat or by producing complex fluids. In
particular, we outline different strategies evolved for movement, defense from
predators, attacking of prey, and reproduction and breeding. From the slimy
defense of the notorious hagfish to the circus-like mating spectacle of leopard
slugs, we unveil remarkable correlations within the flow behavior and
biological purpose of biological complex fluids. We discuss recurring
phenomena, propose flow behavior for undescribed complex fluids, and put these
in context with the animals survival strategy. With this review, we hope to
underline the importance of complex fluids and material flow in the animal
kingdom.
