Have you tried calling them over and pushing the trigger with a pecking motion to show them? That's how mine got the hang of horizontal chicken nipples.
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Going from open waterers to nipples or cups can take some time.So hubby made a nice feeder and water dispenser, out of PVC, for the new hen house...the feeder works great, holds plenty and the pullets don't spill any, but I'm having a bit of a problem getting them to work the drinking cups, the still haven't learned to peck at the yellow to fill the cup so they just drink until the cups are empty and then squawk for me to refill them
I would like to stop filling those cups for them, but I'm afraid they won't drink enough, any suggestions?