You have always shown interest in science and your thread about these micro hairs on bats needs modern developments to understand how I think they work.
This is not a leg-pull, and I may be wrong but from the info in your link the miniscule dimensions of the hairs seem too fragile just to sense airspeed/direction of the bat.
The accurate sonic navigation system of bats is well known, but there is a question mark on the resolution of the sound waves when the wavelength is much larger than the size of smaller prey.
An answer to this I suggest is the function of the hairs. We know most atmospheric molecules form bunches. This property comes under a heading called 'Diffusion in Gasses'. A search for 'Feyneman+ Diffusion' would be a good start. Don't be put off by published mathematics, in most of which the abundance of undetermined variables reveals how little we know about localised behaviour of gasses.
My own intuitive explanation is that the common gasses tend to assemble together in clumps, but break apart easily, ie. by turbulence by the beats of an insect's wings. The bats micro hairs sense the texture of the prey's path through the air to home in on the target.
Yep we are hear a lot of the time to have a bit of fun. But do not stop posting info if you think we should read it. I am 75 and still like learning new things. Not of the nature that you cannot learn a old dog new tricks
I imagine it's similar to the way that fish can detect tiny variations in pressure and turbulence (and sometimes electro-magnetic variations) on their lateral lines - enabling them to sense prey and danger.
Nah, I just thought of that line when I read the article, I think it's wool of bat, to be pedantic, and my thought process doesn't necessarily work like everyone else's, as others may have noticed at times...