Do fish blink, and why don’t chickens fly?

We explore the curious questions that science can answer

Holy mackerel: fish have excellent eyesight (Getty/iStock)

Do fish blink?

No. Like snakes, they don’t have moveable eyelids. Instead, they have a transparent eye protector permanently in place. Fish have excellent eyesight and can see parts of the spectrum we can’t. They rely heavily on visual signals for species recognition, choosing a mate and territorial defence.

When a cat gets fat, do its whiskers grow longer?