What is an invertebrate?

Photo: M Bulbert © Australian Museum.
There are so many invertebrates on this planet that it is impossible to count them all. They come in many shapes and sizes, live practically anywhere and provide many services that are vital for our survival. Yet so many of us are unaware of what an invertebrate is.
There is a good chance that you have seen an invertebrate recently. Do you recall batting away a fly, unearthing a worm, or admiring a spider as it waited to catch food in its web. Well guess what? All of these animals and many more are collectively known as invertebrates - animals that lack a backbone.


