Understanding the human body is a team effort. That's where the Yachtel group comes in.

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This is Scientific American 60 Second Science. I'm Joshua Rappler.

New technology is putting the focus on rarely witnessed aggression between two of the fiercest predators in North America.

For the last few decades, populations of cougars and bears have been on the rebound.

But until recently, researchers didn't know how these formidable predators interacted.

To improve their understanding of these potential heavyweight matches,

scientists set up motion-sensitive cameras in British Columbia, where both species are increasing in number.

The researchers rigged the countryside so that black bears wandering the shorelines of Vancouver Island

would trigger the

playing of recorded sounds of cougarrels over loudspeakers. Video cameras captured the bear's

reactions, which were not timid. They almost invariably approached the sound source, and in

many cases did so in sort of an aggressive manner. Justin Serassi, an environmental studies researcher at the University of California, Santa Cruz,

involved with the research.

This aggressive behavior manifested in different ways.

Mother bears were the feistiest, with six moms actually charging the cougar sounds,

and one even biting a speaker.

On the other hand, solitary bears moved towards the speakers making a huffing noise, often

associated with aggression.

...