Include an X in a word and it always adds gravitas. In fact, the only thing better is a U-less Q.

But the syrinx is a truly uniqe thing.

Syrinx
- The vocal organ of a bird.

So what's special about it?

The syrinx is found at the base of a bird's windpipe. This differs from the vocal organ of mammals, amphibians and reptiles - the larynx - which sits at the top of it.

This means the syrinx uniquely sits at the junction of the windpipe and its two main branches. And it's this arrangement that allows birds to sing multiple notes simultaneously. This is why birdsong is so wondrously melodic to our ears.

And it's also why birds need all the protection we can offer them - check this excellent book out if you need convincing:

Rebirding: Rewilding Britain and its Birds