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http://www.physics.unl.edu/~fulcrum/ Department of Physics & Astronomy University of Nebraska-Lincoln Lincoln NE 68588-0111 fulcrum2@unl.edu 402-472-8685 Embryology. Animals that lay eggs. Birds. Bird eggs come in all shapes and colors. Very large. Very small.
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http://www.physics.unl.edu/~fulcrum/Department of Physics & AstronomyUniversity of Nebraska-LincolnLincoln NE 68588-0111fulcrum2@unl.edu402-472-8685Embryology
Very large Very small
Reptiles Iguanas, monitors and alligators all lay eggs
Mammals Echidna Two mammals lay eggs Both live in Australia