New GM technology that selects only female chicks to hatch could improve animal welfare - but what might be the real cost?
All tagged sex determination
Why Y bye-bye? Is the Y chromosome disappearing and will men really go extinct?
The Y chromosome is shrinking - but this doesn’t mean that males will vanish altogether. For the Amami spiny rat, this has already happened - so how do they cope?
Hot stuff: how climate change is affecting sex ratios
For species whose sex is influenced by temperature, like turtles and toads, climate change could cause a catastrophic shift in the balance of males to females.