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Butterfly eggs as seen under an electron microscope:

Butterflies breed as many animals do---eggs from the female insect are fertilized by sperm from the male. The female butterfly stores the male's sperm in a bursa, or sac, until she is ready to lay eggs. Depending on the species, females lay eggs one at a time, in clusters, or in batches of hundreds. Butterflies lay an average of between 100 to 300 eggs, although some species may only lay a few dozen, others can lay as many as a thousand or more.

Read more: Facts About Butterfly Eggs | eHow.com http://www.ehow.com/about_7230489_butterfly-eggs.html#ixzz2NoMftD1I