How many eggs can an emu lay? How heavy is an ostrich egg? How much does a caterpillar weigh? How much does an emperor penguin egg weigh? How much do baby orangutans weigh? How fast can an emu run? How much does
Birds and reptiles also lay eggs. N.C. State University researcher Mary Schweitzer discovered a medullary bone in the leg of a Tyrannosaurus rex. Birds use this bone to store extra calcium for egg production [source: Fields]. Researchers have found fossilized eggs in locations around the world...
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