Animal Characteristics : Animals are multicellular eukaryotes whose cells are bound together by collagen.pable of movement. Mobility is one of the primary characteristics of the animal kingdom 1 . Diversity and Abundance : Over 1.5 million living animal species have been described. Approximately 1.05 million species are insects, over 85,000 are mollusks, and around 65,000 are vertebrates. Scientists estimate that there may be as many as 7.77 million animal species on Earth 1 . Body Length and Ecological Interactions : Animal body lengths range from tiny microorganisms (8.5 μm or 0.00033 in) to massive creatures (up to 33.6 m or 110 ft). Animals form intricate food webs and have complex interactions with each other and their environments 1 . Evolution and Fossil Record : Animals first appeared in the fossil record during the late Cryogenian period. The Cambrian explosion (around 539 million years ago) marked the diversification of modern animal phyla. Most animal classes emerged duri
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