National Geographic News, Reporting Your World Daily

Monday, November 23, 2009

Photo: Giant Sperm Is Ancient Evolutionary Tool, Study Finds


Email to a Friend	<< Back to Full Story

Each of the giant sperm cells (left) of seed shrimp (right) can reach up to ten times the body length of the animal. The supersize sperm is an adaptation stretching back at least a hundred million years, a June 2009 study says.

Photographs courtesy Renate Matzke-Karasz