Invertebrates are animals without backbones and there are millions of different sorts on our planet.
Many have a hard 'shell' on the outside which gives them their shape, and a soft inside.
Insects are invertebrates which have a hard outside and a soft inside (that means that they go 'scrunch, then squish' when you step on one by mistake - yuk!).
Some invertebrates have a soft inside and a soft outside:
OK, so it's time to find out more about invertebrates, what they're like and how they are sorted into groups.
Let's get sorting!