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In this and the following pages, jumping spiders are used solely to illustrate how sexual selection works. Not all of the information presented has been documented in actual jumping spiders.

Because of the difference in gamete size, males and females devote different amounts of their bodily resources to each gamete. Use the buttons below the graphic to advance or go back one frame at a time. Users who prefer keyboard controls instead of buttons may use "f" for forward and "b" for back. Or skip to the no-graphics page.