Tim Birkhead

The Australian wedge-tailed eagle has enormous eyes, both in absolute terms and compared with most other birds, and as a result has…

— Tim Birkhead

“As drought kicks in, the choughs experience several things simultaneously. The shortage of food increases their stress levels; the birds are forced…

— Tim Birkhead

The human eye has long fascinated lovers, artists and physicians. The ancient Greeks dissected eyes, but struggled to understand how they worked,…

— Tim Birkhead

“When I mentioned to a friend I was writing a book about eggs he told me to be sure to mention how…

— Tim Birkhead

I am not going to speculate about the emotions that might be involved in avian infidelity.

— Tim Birkhead

“Ingeniously, [Heinrich Wickmann] was able to use a pencil to mark that bit of the egg he could see inside the hen's…

— Tim Birkhead

“One of the most remarkable of all ornithological discoveries was the realisation that birds in temperate regions undergo enormous seasonal changes in…

— Tim Birkhead

Although we tend to think of the brain as a discrete organ - a lump of squidgy tissue - it is better…

— Tim Birkhead

Compared with mammals, birds have relatively large eyes. In simple terms, a bigger eye means better vision, and excellent vision is essential…

— Tim Birkhead

There are several ways we can know what a dog, a bird or, indeed, any other organism can see, for example either…

— Tim Birkhead