When loud helicopters or fighter jets pass overhead, Colorado checkered whiptail lizards spend less time moving around and more time eating and their levels of the stress hormone cortisol rise
living on Fort Carson US military base near Colorado Springs. Apache, Chinook and Black Hawk helicopters andoperate from the base, so the researchers wanted to see if they affected the behaviour of the lizards.
To facilitate the study, undertaken in 2021, US army pilots flew over test areas on specified days, and avoided them on others. During flyovers, the sound at ground level peaked at 112.2 decibels – about – while maximum levels were otherwise just 55.8 decibels, which is about the level of the buzz of a refrigerator.The researchers caught a total of 82 lizards, which are considered a species of special concern by Colorado Parks and Wildlife, after observing their behaviour for 3 minutes.
The lizards, which are an all-female species that reproduces asexually, spent less time moving around and more time eating when exposed to aircraft noise. Next, Kepas and her colleagues weighed the reptiles and drew blood for hormone tests. This revealed that levels of theA monthly celebration of the biodiversity of our planet’s animals, plants and other organisms.
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