A tiny change to an inner ear bone led bats to evolve into two groups

, but they both contain many echolocating bats. The groups are called the Yinpterochiroptera and the Yangochiroptera.

This created a puzzling question, says Luo. Either echolocation evolved twice, in each group, or it evolved just once in an ancestral bat species and was then lost in some lineages.Luo and his team have now identified an anatomical difference between the Yinpterochiroptera and Yangochiroptera. In the heads of mammals, signals are carried from the ears to the brain by a specialised set of neurons that run through a bony tube called Rosenthal’s canal.

This change meant Yangochiropteran bats could evolve more neurons to carry sound information, and could reorganise them more freely, compared with Yinpterochiropterans. This may explain why the Yangochiroptera have diversified into so many species, and why they echolocate in a different way to the Yinpterochiroptera, argues Luo.

However, the finding doesn’t resolve the question of whether echolocation evolved once or twice. “It’s still possible that echolocation evolved in the bat common ancestor before the split of these evolutionary lineages,” says Luo. But if that is the case, echolocation must have changed a lot during the early stages of bat evolution.

tell them how the birds changed their song just for their noise pollution. vroom vroom right toot toot empowerThePeoples

It all depends on conditions. Some bats had one condition and another group a different set of conditions. The ones still around adapted while all the other went extinct. That's how it's supposed to be.

kind of like how you operate separate from actual data and scientific principles, when medical Patent-holders enter your back-door, New Pfizerist....oops I mean New Scientism...I mean, New Schillery. Sorry I meant No Scientsist. My bad

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