Water draws wildlife. Especially in the kind of heat we have in the summer.
Some critters obviously need it; dragonfly larvae are sometimes called “water tigers”.
And some are not as obvious.
I’ve caught the little lizards, and some of the bigger ones, drinking at the pool in the mornings. Don’t usually get a picture, though.
So it looks like the ones out in the main yard either travel a ways to get to the pool, or possibly get their water from dew in the mornings. No way to be sure!