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Crocodiles can reproduce without males – and maybe dinosaurs could too

6 June 2023

An egg laid by a female American crocodile with no access to males developed into a fully formed fetus in the first known case of "virgin birth" in a crocodilian


Male crazy ants have two different sets of DNA in their bodies

6 April 2023

A bizarre mode of reproduction discovered in yellow crazy ants results in males that have two separate sets of DNA in different parts of their body


Two orcas

Orca mothers forgo future offspring to care for their full-grown sons

8 February 2023

Female orcas in the north Pacific hunt and share food with their adult male offspring, and this seems to limit their chances of having more calves


Fruit fly

Male flies produce a chemical that makes females sleep in after mating

22 December 2022

A “sex peptide” transferred from male to female fruit flies during mating interferes with the female’s biological clock, reducing her chances of mating again


Clusters of sperm

Sperm move in packs like cyclists to push through thick vaginal fluid

22 September 2022

In mock-ups of the female reproductive tract, bull sperm cluster in groups of two to four, which seems to help them swim upstream


spider

Female black widow spider mates with and eats multiple males

29 April 2021

Female black widow spiders often mate with and eat only one male – but in one species the female will mate again, meaning males die even though they may not father offspring


Ewes prefer to mate with submissive rams when given a choice

Ewes prefer to mate with submissive rams when given a choice

1 April 2021

When presented with a choice between a subordinate and dominant male, female sheep choose the less aggressive rams – which helps increase genetic diversity among lambs


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