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Fisherian runaway
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Fisherian runaway or runaway selection is a sexual selection mechanism proposed by the mathematical biologist Ronald Fisher in the early 20th century, to account for the evolution of ostentatious male
The peacock tail in flight, the classic example of an ornament assumed to be a Fisherian runaway
The peacock tail in flight, the classic example of an ornament assumed to be a Fisherian runaway
Female (left) and male (right) pheasant, a sexually dimorphic species
Female (left) and male (right) pheasant, a sexually dimorphic species
Peacock spider males perform courtship dances that display their boldly patterned chelicerae, legs, and abdomens. Females are cryptic brown.
Peacock spider males perform courtship dances that display their boldly patterned chelicerae, legs, and abdomens. Females are cryptic brown.
The peacock, on the right, is courting the peahen, on the left.
The peacock, on the right, is courting the peahen, on the left.
Secondary sex characteristic
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A secondary sex characteristic is a physical characteristic of an organism that is related to or derived from its sex, but not directly part of its reproductive system. In humans, these characteristic
Fisherian runaway
…motives from which wild animals choose between a number of suitors; partly because there remains no satisfactory explanation either of the remarkable secondary sexual characters themselves, or of their careful display in love-dances, or of the evident interest aroused by these antics in the female; and partly also because this…
A peacock displays his long, colored tail, an example of his secondary sex characteristics.
A peacock displays his long, colored tail, an example of his secondary sex characteristics.
An adult human's Adam's apple, a visible secondary sex characteristic common in males
An adult human's Adam's apple, a visible secondary sex characteristic common in males
A red deer stag's antlers are secondary sexual characteristics.
A red deer stag's antlers are secondary sexual characteristics.