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Wait a second. What if they werent stressed? What if they were excited? I mean, the drone could be carrying some delicious honey from Amazon. Or it could even be a carton of weed.
In all 17 drone encounters for which the researchers had heart-monitor data, the bears heart rates soared one by as much as 46 beats per minute, another by 56 beats per minute, and a third (a mother bear with two cubs) by more than 120 beats per minute, from 41 to 162. While their heart rates returned to a more normal resting rate within 10 minutes after the encounter, the drones presence clearly caused the animals at least some significant physiological stress.
In all 17 drone encounters for which the researchers had heart-monitor data, the bears heart rates soared one by as much as 46 beats per minute, another by 56 beats per minute, and a third (a mother bear with two cubs) by more than 120 beats per minute, from 41 to 162. While their heart rates returned to a more normal resting rate within 10 minutes after the encounter, the drones presence clearly caused the animals at least some significant physiological stress.