Spine cross section of hedgehog
![](https://lizzieharper.co.uk/wp-content/uploads/2021/05/Hedgehog-Ericaceus-europaeus-cross-section-through-single-spine-and-skin-500x430.jpg)
Spine cross section from a hedgehog
Illustration from “30 Animals that made us smarter” by Patrick Ayree (BBC Books).
Spine cross section from a hedgehog
Illustration from “30 Animals that made us smarter” by Patrick Ayree (BBC Books).