Gambusia....toughest fish on earth?

So a 600 gallon pond wasn't enough. I wanted something out by the swimming
pool, so I took a 25 gallon flower pot, plopped a water lily in it, a few
strands of elodea, a crawfish, 30 or 40 tadpoles, and a half dozen gambusia
(mosquito fish, sometimes referred to as "minnows" by us Southern
creek-crawling kid's of the 60's).

After a few hours of direct sunlight here in sunny Texas (the lily hasn't
covered the surface, obviously) the crawdad was toast, the tadpoles were
racing around the rim like their tales were on fire, and the gambusia were
just non-chalantly cruising the warming waters. I stuck my finger in and
thought "That's hot!"

So I got my digital thermometer and measured the temp.......104.5F at the
surface.....104.1F at the bottom.....!

Three days later.....all the tadpoles are history.....but the gambusia are
still just swimming so gracefully in the steaming water.....are these fish
tough or what? The hot water just glides off their back....

Jay (No, I will not put any goldfish in....)