facebook
twitter
rss
account
search
search
 

Squids' giant eyes seen as defense aid

March 15, 2012 at 2:55 PM   |   Comments

DURHAM, N.C., March 15 (UPI) -- Giant squid have giant eyes -- among the biggest in nature -- for defending themselves from sperm whales, their biggest enemy, a U.S. researcher says.

"They're most likely using their huge eyes to spot and escape their predators, sperm whales," Duke University biologist Sonke Johnsen says of the animals' basketball-sized orbs.

Johnsen was part of a team that modeled, both physically and biologically, how and why a squid uses such a big eye, and found the design and size of the eye give squid the ability to see approaching sperm whales as they disturb bioluminescent organisms in deep ocean waters, a Duke release reported Thursday.

The team found the large eyes collect more light compared to animals of similar size but with smaller eyes.

That's critical for detecting low light differences such as the bioluminescence stimulated by large animals such as approaching sperm whales, Johnsen said.

Bigger eyes mean seeing more of the faint light and predicting the predator's approach, she said.

"It's the predation by large, toothed whales that has driven the evolution of gigantism in the eyes of these squid," Johnsen said.

© 2012 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Recommended UPI Stories
Most Popular
1
Newfoundland fossil is earliest evidence of muscled animals
2
Study: gamblers' brains not unlike those of pigeons
3
Tech industry All Stars developing 'Star Trek'-style communication badges
4
Latvia boasts world's first net for migrating bats
5
Washington State's Elwha River flows free once again
Trending News
Video
x
Feedback