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Invertebrates are the most abundant creatures on the planet — comprising more than 97 percent of all known animal species. By definition, an invertebrate is an animal without a backbone. That includes jellyfish, sponges, worms, snails, bees, lobsters, and spiders.

Desert Hairy Scorpion

Commonly thought to be part of the insect family, scorpions are actually classified as arachnids.
A small reddish crab with bright yellow eyes

Vampire Crab

Vampire crabs are tiny, colorful, and native to parts of southeast Asia.