In 2006, biologists from the University of Manchester, found a duck egg in a small pond on a field trip to the French Alps. They noticed something moving inside it, and cracked it open to find three live minnows inside.
The phenomenon left the biologists and several others experts “baffled.” Some of the biologists hypothesize that that the egg fell into the pond following some kind of predatory attack, but that still doesn’t explain how minnows got to be inside.
The biologists wrote to New Scientist magazine, in the hope that readers could solve the mystery. This is yet another strange but slightly hilarious quirk of nature. Who knows, maybe in a lake miles away, a duck hatched from a fish’s egg.