Maybe there is something in it

That males are supposed to keep their brains in their testicles...

In horses geldings are usually amendable and often a little dimwitted. Mares are a bit smarter usually. Calypso the stallion though is pretty darn smart.

The minis are on limited grass (it is a fact of life for them) and every morning they go out onto a grassy patch for a while and are taken off it and put back in a bare paddock after a couple of hours. This isn't necessarily to their liking as it is more fun on the grass if you are a short hungry horse. Anyway this morning Calypso waited until I put his lead rope on and left him to get his two girls. By the time I got back to him he had wandered off and was standing inside the gate of his bare paddock waiting to have his halter off. Now that wouldn't have been his choice of behaviour, but obviously he had decided it was inevitable so he might as well get on with it. The other thing he does is turn round so you can do his cover straps up - I used to tell him off for moving until I realised he was being helpful.