Related topics: females · sperm

How birds become male or female, and occasionally both

The highly unusual "semi-identical" Australian twins reported last week are the result of a rare event. It's thought the brother and sister (who have identical genes from their mother but not their father) developed from ...

Why animals court their own sex

Same-sex sexual behaviour is common in animals but puzzles evolutionary biologists since it doesn't carry the same obvious benefits as heterosexual courtship behavior that leads to mating and production of offspring. A study ...

Scientists discover oral sexual encounters in spiders

Researchers from Slovenia have discovered oral sexual encounters in a spider, and have published their findings on April 29, 2016 in the journal Scientific Reports. Spiders are known for their unusual sexual behaviors, notably ...

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