Also, chickens can swim/float very well with no effort at all (like ducks) but they will struggle to get out of the pool therefore will exhaust by trying to get out and will drown by giving up.
One of my chickens, fell in my pool and was in there for a long time before I got home and found her, it is summer here but it was raining. When I picked her up she fainted in my arms. Took her to the vet and she had hypothermia, had her under a heat lamp for 3 days. She is fine now, but was...