Bluebird

 The bluebird didn't realize what she was getting herself into when she chose her new home, about 75 yards from a natural gas compressor. It was only as the days and weeks wore on that the low whine of machinery started to take a toll. It was harder to hear the sounds of approaching predators, or even the normal noises of the surrounding world, so she had to maintain constant vigilance. Her stress hormone levels became skewed; her health deteriorated. She couldn't resettle elsewhere, because she had a nest full of hatchlings to tend. Yet her chicks suffered too, growing up small and scantily feathered — if they survived at all.Scientists couldn't ask the bluebird what she was feeling. But when they sampled the bird's blood, as part of a study of 240 nesting sites surrounding natural gas treatment facilities in northern New Mexico, they found she showed the same physiological symptoms as a human suffering from post-traumatic stress disorder.“Noise is causing birds to be in a situation where they're chronically stressed . . . and that has really huge health consequences for birds and their offspring,” said Rob Guralnick, associate curator of biodiversity informatics at the Florida Museum of Natural History.