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A_Wanderer

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A spot found on some male collared flycatcher’s forehead reflects how well the immune defence system works against viruses, scientists at Uppsala University said.

The white spot is also attractive to the females of the species seeking out a mate.

Evolutionary biologists have long been searching to explain why individuals differ in appearance and why behaviour influences a choice of mate with appearance features that cannot reasonably be thought to have any usefulness.

Therefore, researchers began to look closely at the genetics behind ‘secondary sexual characters’ – such as the tail of a peacock, the stripes of the female gulf pipefish and the white spot on the forehead of the collared flycatcher.

Females of bird species prefer to mate with those who have the most colourful ornament, or those who display the most complex song, among other displays.
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