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The difference between sexes can include:
- Size: Males in some species have harems ('ownership' of a group of females). In this case the males are usually larger than the females, e.g. gorillas, lions. In some species the male is smaller.
- Sometimes, one sex has additional features : antlers of deer, breasts of women,...
- Colouring: sexual dimorphism in butterflies is common.
Sexual dimorphism may be the result of natural selection or more specifically sexual selection, that is, competition between members of the same species for reproduction: some traits would give an individual an advantage over its rivals in survival and reproduction. More generally, sexual dimorphism is inherited, which means the differences between males and females have survival value.
Some animals show these differences only during mating season. Deer shed their antlers and peacocks shed their tails out of season. This minimises the key disadvantage of sexual dimorphism, which is, it makes the male much easier to be seen by predators.
There is other polymorphisms.
Female (left) and male Argiope appensa spiders: the male is much smaller than the female
References[edit | edit source]
- Andersson, Malte B. 1994. Sexual selection. Princeton University Press. ISBN 978-0-691-00057-2
- Bonduriansky, Russell 2007. The evolution of condition-dependent sexual dimorphism. The American Naturalist 169 (1): 9–19.