Copper eyes in cats are a deep orange colour that can look like it has light brown in it. These are rare and striking ...

The least popular eye colours in a man were black and purple ... trended towards the bottom middle of the women’s list, with brown eyes – the most common in the world – receiving only ...

The range of colours an animal sees depends on the combination of colour-sensitive pigments in their eye and the processing by the brain. With fewer cone types, dogs can't distinguish between as many ...