Animal body lengths range from 8.5μm (0.00033in) to 33.6m (110ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs.

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animal, (kingdom Animalia), any of a group of multicellular eukaryotic organisms (i.e., as distinct from bacteria, their deoxyribonucleic acid, or DNA, is contained in a membrane-bound nucleus).

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The rest of the animal kingdom is dealt with by invertebrate zoology, a vast and very diverse group of animals that includes sponges, echinoderms, tunicates, worms, molluscs, arthropods and many …

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