Two rats one day were seeking food, and found an egg—an ample feast for such as they.
Delighted, hungry, they were just about to sink their teeth in when they spotted, at a little distance yet but closing fast, an inconvenient interloping fox.
How save the egg? They couldn’t pack it up and in their forepaws carry it away; to roll or drag it would be risky, and impossible besides.
Necessity begets ingeniousness, and did that day. The first rat, lying supine, held the egg; the other grasped his tail and, stumbling and misstepping, pulled him like a rat-sled home, evading thus that parasite, the fox.
And Descartes thinks that animals are clocks!