You should have been more suspicious of your source, which was a weekend-envornmentalists site. The dummies didn't even know what they were photographing.
The "red-legged frog in the pic you posted is a misidentified Leopard Frog. So were quite a few of the frogs when I did a Goggle Image search on red-legged frogs.
Here are a few true red-legged frog pics...
