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Our first exception today concerns the hermit crab and the animal that determines whether hermit crabs live or die. Hermits don't eat snails, but snails are the most important things in the life of a hermit crab. And it all relates to our ongoing to tale of bilateral asymmetry. Biology concepts - bilateral asymmetry, directional asymmetry, antiasymmetry, crabs, evolution, mate choice, sexual selection, sexual dimorphism

Shape of Life is a series of short classroom videos that beautifully illustrate the evolution of the animal kingdom on planet earth. Based upon an original PBS Series, Shape of Life, is especially designed for students and teachers who want a first-hand account of how animals adapt and thrive.