I've lost more adult chickens (3+) or wild birds (9+) in the horse trough than babies. It happens so often I can tell just by looking out the window from the house, 100+' away. Based on the body language of the horses. I go fish the body out. Once a magpie was still alive. After drying out it flew away!
Another time it was a hen who was border line feral. We spoke about penning up all the birds, no more free ranging, because of a recent uptick in predictor attacks. We found her the next day in the trough. We joked she'd heard us talking and decided she's rather die free than be cooped up.
I can't recall ever having a chick drown. Lost many to about every other issue just not that one. The waterer I use is super tiny. It's changed daily and upgraded when they are more active at about a week. Here's a pic of the starter one. This is the smallest one I've seen available at feed stores.
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