Great fleas have little fleas upon their backs to bite 'em
—Augustus De Morgan, "Siphonaptera", after Jonathan Swift
And little fleas have lesser fleas, and so ad infinitum
We recently published a picture of an alligator with a frog on its back, and when I saw Jessa's picture of a frog adorned with snails I thought immediately of the doggerel above, and wondered what sort of hitchhikers the snails might themselves be carrying. It's not quite "turtles all the way down", but there's sure to be more life here than the camera or our own eyes can see...
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