Interesting conversation on sexing

[JakRat]

https://www.backyardchickens.com/forum/viewtopic.php?id=36320

So I tried the flip over on back thing and my control was my one boy that I know I have. He doesnt mind laying on his back on my lap... but my two cuckoo marans usually flip out for a few seconds.... sigh... what do yall think?

 

[SamuelMcF]

If this worked hatcheries wouldn't pay chicken sexers all year round