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Though the order of flies (Diptera) is much older, true houseflies are believed to have evolved in the beginning of the Cenozoic Era. [18] The housefly's superfamily, Muscoidea , is most closely related to the Oestroidea (blow flies, flesh flies and allies), and more distantly to the Hippoboscoidea (louse flies, bat flies and allies).
Female flies compete for male choice, and researchers have observed that male E. borealis do discriminate among potential female mates at swarm sites. In one study, female flies with larger wings participated disproportionately in copulations at each swarm site, but male size and the size of nuptial gifts did not show a correlation with the ...
Flies have a mobile head, with a pair of large compound eyes, and mouthparts designed for piercing and sucking (mosquitoes, black flies and robber flies), or for lapping and sucking in the other groups. Their wing arrangement gives them great manoeuvrability in flight, and claws and pads on their feet enable them to cling to smooth surfaces.
The video seamlessly cuts to kids jumping into the frame on the other side, now high school seniors clad in caps and gowns. View this post on Instagram A post shared by Mr. Tausch ...
A gynandromorph can have bilateral symmetry—one side female and one side male. [24] Alternatively, the distribution of male and female tissue can be more haphazard. Bilateral gynandromorphy arises very early in development, typically when the organism has between 8 and 64 cells. [25] Later stages produce a more random pattern. [citation needed]
Homosexual behaviour is demonstrated by 120 known species of birds. [40] While an uptick in research on bird homosexuality – and animal homosexuality in general – has been coming out in recent years, it is common for some authors to labour in articulating the view any root cause or function of bird homosexuality is poorly understood.
Backlash was fierce after news broke that Warner Bros. is developing an all-female 'Lord of the Flies' -- a story inherently about masculinity.
“The sex characteristics a person is born with do not signify a person's gender identity. When people have ‘gender reveal parties,’ it really should be called a ‘genital reveal party ...