A southeast-facing entrance per se thus seems to be the specific nest feature preferred by females, rather than the effect of selective positioning on current at the nest entrance.
That has provoked a debate about whether the phenomenon is an aberration, or whether natural selection favours it, at least when it is rare in a population.
While chimpanzees are social creatures, they don't show a preference for collaborating with one another, an October study finds. Children, on the other hand, prefer teamwork.
The ghost mother had given birth to a thousand sons of her own, but unfortunately, she had a fondness for the flesh of human children. Consequently, the human race was close to extinction.
Boys studying for GCSEs were more likely than girls to read print products such as comics, with 38% saying they read newspapers at least once a month compared with 30% of girls of the same age.
Given that there is a living to be made at night, and given that alternative daytime trades are thoroughly occupied, natural selection has favored bats that make a go of the night-hunting trade.