Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne How does a Bird lay an Egg?
Name: Jane
Location: N/A
Country: N/A
Date: N/A

How does a bird lay an egg? (This is one of many questions posed by my first grade class.)

I will try to explain this to a first grader.

Birds have to fly to get food and to run away from their enemies. Only the females lay eggs. Female birds can not carry heavy eggs in their bodies for the weight would keep the bird from flying. When she is ready to lay her eggs, she makes them very fast. Her body builds the soft parts of the egg. Her body rolls the soft parts down a tube. This tube makes the hard shell around the soft parts. The hard shell is completed just as she lays the egg in the nest. The hard egg is pushed out of her body for the tube can stretch.

I hope this is adequate. I know the sentences are too complex for a first grader.

Steve Sample

Click here to return to the Biology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (, or at Argonne's Educational Programs

Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory