Why birds' eyes can be blue, green, pink or orange

Among birds, eyes come in all sorts of colours – and it seems that this helps them compete for mating opportunities and intimidate rivals

SINSIN
Oct 20, 2023 - 17:00
 0  4
Why birds' eyes can be blue, green, pink or orange
Among birds, eyes come in all sorts of colours – and it seems that this helps them compete for mating opportunities and intimidate rivals

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