快猫短视频

Birds perch standing up, bats upside down. Are there any bird or bat exceptions to this? And why do the two perch differently?

David Hambling, By email, no address supplied

We pay 拢25 for every answer published in 快猫短视频. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.

This article appeared in print under the headline 鈥淧erfect perch鈥�