Here's a couple of frogs my kids were playing with last week. I have no idea what species they are. There was a small group of them found in the pool one morning.
I'm guessing they came up from the creek overnight, which has extremely little water left in it. We've been in drought for four years now. In fact it was 47C (116.6F) that day, 'whew!'.
Over time we've discovered in the pool, Bee Swarms, Wasps, Snakes, a Duck, Rabbits, Spiders, and the usual assortment of other insects.