It's not the heat that is the issue with plastic buckets, it's the UV rays. If you paint the bucket with white paint it will keep the feed cooler and keep the UV rays from degrading the plastic so it will last much longer. Also keeping shaded most of the time will help.
Chickens are much bigger than doves. If you extend the step of the treadle out and take out the part of the step close to the opening the doves won't be able to reach the feed with their shorter necks.
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That's a real good tip about those treadle on the feeders. Thank you! Mine are all the standard size, so it would work for mine.
