Living in fear can be deadly, dragonfly study shows

Stress can kill on a dramatic scale, according to a new study of immature dragonflies forced to live next to scary predators. In a newly published study, dragonfly larvae living within sight and smell of a predators such as fish had 2.5 to 4.3 times higher mortality than dragonfly larvae living in a predator-free environment — even though the dragonfly larvae were protected by a cage and could never be eaten by the predators.   link