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What a peacock sees when it looks at a potential mate - and what your dog actually sees when you throw a ball

Peacock feather Birds have four types of cone cells in their eyes called photoreceptors (humans have three), and can see many more colours than we can. They can also see ultraviolet, which means that the 'eye' markings in a peacock's tail features looks sharper

Versuch eines Farbensystems : Schiffermüller, Ignaz, 1727-1806 : Free Download & Streaming

Colour wheel by the Austrian entomologist Ignaz Schiffermüller, featured in his treatise on colour Versuch eines Farbensystems (1772)