frog's camouflage

I nearly stepped on a frog the other day. I didn't see him at first. Something you might expect in grass, or swampy vegetation. They are naturally camouflaged for their normal surroundings. They have been evolving for 265 million years to do this. But this guy blends in perfectly to the concrete headland in my glasshouse. Which means they are still evolving, or I badly need to power hose the floor.

look closer...