Draft:Reversed sexual dimorphsim
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Comment: Definitely a very interesting concept, and likely notable. The third source is a blog and thus not a reliable source, but I'm sure you can easily find more journal articles treating the subject of reversed sexual dimorphism in detail. Good luck! Chaotic Enby (talk · contribs) 15:20, 16 October 2024 (UTC)
Reversed sexual dimorphism, or RSD, is when females of a species are larger or more colourful than males. This characteristic can be found in many species of birds, fish, and reptiles. This can be a form of reverse dichromatism, or usually just a form of size difference.
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Examples
[edit]Birds
[edit]Birds that show reverse sexual dimorphism include hawks, falcons, some sandpipers, plovers, jacanas, skuas, owls, some cuckoos, a few hummingbirds, Eclectus parrots, fairywren and some ratites.[1]
Eclectus
[edit]The Eclectus parrot is one of the most shockingly reverse-dichromatic birds in the world. The male is a brilliant green colour and, depending on the species, the female is a mix of red, blue, and maroon. The upper mandible is also a different colour; in the male, it is yellowish-orange, in the female it is black.[2]
Fairywren
[edit]Fairywren (Maluridae), at first glance, are not a reversed sexually dimorphic group, but a regular one. However, studies show that while male fairywren have longer tails that the females in the breeding season, their tail shortens much more rapidly in the nonbreeding season than the females.[1]
Fish
[edit]Fish that portray reverse sexual dimorphism include Cichlids and Anglerfish.
Anglerfish
[edit]One of the most dramatic case of RSD in anglerfish is the Triplewart seadevil (Cryptopsaras couesii). In this species, the male is 10 times smaller than the female, and has a very rudimentary body, and whose only purpose is to find a female, and latch on to her with his jaws. Once latched on, his mouth will fuse into her body, and she will have to supply him with nutrients from her blood. Over time, he will lose his organs and his eyes, "atrophying into nothing but a bag of sperms ready for discharge for fertilization."[3]