In article ,
songbird wrote:

http://www.anthive.com/fun/100_6909_TodaA.jpg

Gray tree frog, I think. You hear them a lot more than you see them,
most of the time.

They do a very nice job of looking like a spot of lichen. Of course,
when a spot of lichen appears on a black steel stair railing (or a plain
gray roof) all of a sudden, it's not such great camouflage. Anywhere
tree-ish it works very well. And even on the stair railing, the first
thought that came to mind was not "frog."

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