The "land crocodile" has a venomous bite and intriguing history.
With their ability to telescopically reproduce, aphids are a natural curiosity.
You can say what you like about rhinos - they're thick-skinned!
Hedgehogs are one of Sir David's favourite species. Find out why.
Sailors a long time ago told stories of having seen a gigantic squid-like creature.
How are owls capable of twisting their heads so far around?
The masters of deception: cuckoos hand over all parental duties to another species.
Look past the skull on a death's head hawkmoth and you'll find more curious traits.
Learn about the life of the presenter with an unrivalled knowledge of wildlife.