The platypus (Ornithorhynchus anatinus) has a puzzling array of features. Not only does it have that iconic duck bill, it lays eggs like a bird or reptile but feeds milk to its young like a mammal.

Brainteasers are a great way to sharpen up your thinking skills and ward off boredom – so why not give this plane-themed puzzle a go. It'll tell you a little about your eyesight ...