TIL About 97% of all animal species are invertebrates. They vary in size from 50 μm (0.050mm) rotifers to the 9–10 m colossal squid.

Read more: https://en.wikipedia.org/wiki/Invertebrate

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  1. > The earliest animal fossils appear to be those of invertebrates. 665-million-year-old fossils in the Trezona Formation at Trezona Bore, West Central Flinders, South Australia have been interpreted as being early sponges.[53] Some paleontologists suggest that animals appeared much earlier, possibly as early as 1 billion years ago.[54] Trace fossils such as tracks and burrows found in the Tonian era indicate the presence of triploblastic worms, like metazoans, roughly as large (about 5 mm wide) and complex as earthworms

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