Can’t you just play the sound of running water and trigger their instinct? I feel like I read that sometime in the last few years.
Did you possibly read it in the comment immediately above yours which was posted 1 minute prior to yours, and then attribute it to an ancient memory?
My mom once told me “if you don’t have anything nice to say, don’t say anything at all” so I’m going to end my comment right here.
Actually, I don’t even know that you have to do that much I’ve seen videos of beavers in captivity seemingly trying to build a dam on dry land
I wonder if there’s some kind of near-surface pipes they might hear water running through.