Sex Reversal Found in Australian Birds, Puzzling Scientists

Scientists in Australia have found something strange happening to some wild birds: their DNA says they're one sex, but their bodies have the parts of the other sex.

They looked at many birds, and about 5 out of every 100 didn't match up.

Most of these birds were supposed to be girls, but they had boy parts.

The scientists think chemicals in the environment might be messing with the birds' bodies during development.

This is different from when some animals change their sex later in life; instead, this happens when they are still growing.