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Male birds can be either beautiful to look at or stunningly musical, but they can never be both.
This trade-off stems from evolution and the pressure males face to secure a suitable mate in order to breed.
Birds - Female - Plumage - Singing - Evolution
Male birds can attract a female through either a stunning plumage or its impressive singing, but to be adept at both is asking too much of evolution, scientists have discovered.
Sexual selection is a phenomenon which means one sex of a species is under intense pressure to attract animals of the other sex.
Pressure - Male - Competitors - Order - Female
More often than not this pressure falls on the male who to distinguish himself above competitors in order to be chosen by the female.
Evolution drives diversification and ensures only the genes of the best males survive.
Amount - Food - Resources - Energy - Means
However, a finite amount of food, resources and energy means birds often develop just one of the traits and neglect the other.
The authors explain in the study, published in the journal Proceedings of the Royal Society B: 'We find evidence for a strong negative relationship between the...
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