Learn how to identify bird eggs by color and size. One of the most interesting ... Does this make them some of the best bird dads? Emperor penguin dads have a special flap to keep their eggs ...

Here’s how to identify eggs by color and size. In a role reversal ... marching up to 125 miles to find food, an emperor penguin female issues a unique call to find their mate among thousands ...

stout flightless birds like ostriches and emus hatch from eggs that are nearly round. Penguins, however, break the mold: Although the aquatic birds can’t take to the air, their eggs are ...