That is actually a pretty interesting idea. Are you saying use the sprinkler solenoids?
That could work. The only problem I see, where I live it is 115 degrees quite regularly. Ants won't survive a day in this kind of weather. I'd have to set it up indoors and make it so they could crawl through a tube or pipe to the cage outside, which could be done. Hmmmm.

I have an idea I am mulling over for a daily feeding system. As it is I tend to just dump a vial or two of ants into my outdoor enclosure. It's big enough that this usually works. If I want to keep them localized I provide some water or sometimes apple juice in a small butter dish lid for them to drink. This keeps them in one spot long enough for the HLs to come eat them.
This idea is a variation of Mitch's idea. What I am thinking of doing this year is setting up a 5 gallon bucket outside the cage with a few inches of wet sand, then run some surgical tubing or other tubing into the cage, so the ants come up out of it like they would a nest entrance. This will slow their emergence and present a more natural setting for HL feeding. The bucket could also contain slices of apple, or a lid of water to help ensure your ants have a good moisture and nutrient content before they are consumed. I believe this would spread the feeing out for a good part of the day and could also allow several "nest" sites for feeding within the cage. This might also be adaptable for indoor use.
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