Featured Research

from universities, journals, and other organizations

Here's Venom In Your Eye: Spitting Cobras Hit Their Mark

Date:
January 26, 2009
Source:
University of Chicago Press Journals
Summary:
Spitting cobras have an exceptional ability to spray venom into eyes of potential attackers. A new study reveals how these snakes maximize their chances of hitting the target. Using high-speed photography and electromyography, scientists uncover the mechanics of a cobra "spit."

Spitting cobras have an exceptional ability to spray venom into eyes of potential attackers. A new study published in Physiological and Biochemical Zoology reveals how these snakes maximize their chances of hitting the target. Using high-speed photography and electromyography, scientists uncover the mechanics of a cobra "spit."

The name "spitting cobra" is a bit of a misnomer. Cobras don't actually "spit" venom, says the study's lead author Bruce Young, director of the Anatomical Laboratory in the Department of Physical Therapy at the University of Massachusetts, Lowell. Muscle contractions squeeze the cobra's venom gland, forcing venom to stream out of the snake's fangs. The muscles can produce enough pressure to spray venom up to six feet.

There are no points for distance, however. To be effective, venom must make contact with an attacker's eyes, where it causes severe pain and possibly blindness. Previous studies have found that cobras hit their targets with alarming frequency—nearly 100 percent accuracy from 60 centimeters.

Dr. Young and his colleagues, Melissa Boetig and Dr. Guido Westhoff, have found the secret to the cobra's success.

Cobra venom does not hit a victim in one spot. Instead, the venom lands in complex geometric patterns. This is no accident, according to the study. The patterns are actively produced by the cobra.

Dr. Young and his team used high-speed photography and electromyography (EMG) to detect contractions of head and neck muscles. They found that cobras engage their head and neck muscles a split second before spitting. The muscle activity rotates the head, and jerks it from side to side and back again, producing complex venom patterns.

"The venom-delivery system functions to propel the venom forward while the [head and neck] muscles produce rapid oscillations of the head that … disperse the venom, presumably maximizing the chance that a portion of the spat venom will contact the eye," the authors write.

The ability to actively disperse venom means that cobras don't need dead aim on the eye. They just need to be in the ballpark.

The paper appears in an issue of Physiological and Biochemical Zoology on the focused topic "Functional Consequences of Extreme Adaptations." PBZ is edited by Dr. James Hicks of the University of California, Irvine and published by the University of Chicago Press.


Story Source:

The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


Journal Reference:

  1. Young et al. Functional Bases of the Spatial Dispersal of Venom during Cobra “Spitting”. Physiological and Biochemical Zoology, 2009; 82 (1): 80 DOI: 10.1086/595589

Cite This Page:

University of Chicago Press Journals. "Here's Venom In Your Eye: Spitting Cobras Hit Their Mark." ScienceDaily. ScienceDaily, 26 January 2009. <www.sciencedaily.com/releases/2009/01/090122152709.htm>.
University of Chicago Press Journals. (2009, January 26). Here's Venom In Your Eye: Spitting Cobras Hit Their Mark. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2009/01/090122152709.htm
University of Chicago Press Journals. "Here's Venom In Your Eye: Spitting Cobras Hit Their Mark." ScienceDaily. www.sciencedaily.com/releases/2009/01/090122152709.htm (accessed September 22, 2014).

Share This



More Plants & Animals News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: San Diego Zoo Welcomes Cheetah Cubs

Raw: San Diego Zoo Welcomes Cheetah Cubs

AP (Sep. 20, 2014) The San Diego Zoo has welcomed two Cheetah cubs to its Safari Park. The nearly three-week-old female cubs are being hand fed and are receiving around the clock care. (Sept. 20) Video provided by AP
Powered by NewsLook.com
Chocolate Museum Opens in Brussels

Chocolate Museum Opens in Brussels

AFP (Sep. 19, 2014) Considered a "national heritage" in Belgium, chocolate now has a new museum in Brussels. In a former chocolate factory, visitors to the permanent exhibition spaces, workshops and tastings can discover derivatives of the cocoa bean. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins