Photo: Giant Sperm Is Ancient Evolutionary Tool, Study Finds



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


NEWS FEEDS    After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed. After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

ADVERTISEMENT

NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

Listen to your favorite National Geographic news daily, anytime, anywhere from your mobile phone. No wires or syncing. Download Stitcher free today.