- News Home
17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- 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.