- News Home
6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
- About Us
ScienceShot: The Physiology of Piranha War Cries
13 October 2011 2:40 pm
When Jaws swims in for the kill, it's to the foreboding music of John Williams. But piranhas sound their own drumbeats. Red-bellied piranhas (Pygocentrus nattereri), for example, make barking noises when caught. To figure out how the fish vocalize underwater, researchers observed them in a tank. The fierce predators made three types of angry grunts: First, when fish stare down their rivals face-to-face, they utter rapid calls, much like those same barks. During full fish-on-fish fights, the piranhas tend to emit two low thuds. The scrappy fish achieved both noises using ultra-fast muscles that beat against their swim bladders, air-filled chambers that aid in flotation, the group reports today in The Journal of Experimental Biology. The third call is the nastiest; piranhas gnash their teeth while chasing another fish away from their dinner.
See more ScienceShots.