So not only do Drones pose a threat to pilots landing their planes at our airports, they in fact raise the heart rates of Black Bears in Minnesota, stressing them...........If you want to study animals in their natural habitat, you want to make sure they’re acting naturally, and not responding to data-collecting devices like Drones............ And, as drones become more common, their presence could have unforeseen consequences on wildlife, particularly endangered species................... These results support the 2014 decision by the U.S. National Park Service to ban all public use of Drones within park boundaries after a low-flying Drone caused a herd of big horn sheep (Ovis canadensis) in Zion National Park to scatter, separating lambs from their mothers

https://www.google.com/url?rct=j&sa=t&url=http://www.latimes.com/science/sciencenow/la-sci-sn-black-bear-drone-uav-ufo-stress-20150814-story.html&ct=ga&cd=CAEYACoUMTI4MDM2OTM4OTQwMDg3NTEyNzEyGjAzMWJmZmM1MjYxMzc1ZGE6Y29tOmVuOlVT&usg=AFQjCNF6tkYXZkaXJYjw1Tbl0mttmrecdw

Don't like 
drones in 
your backyard?
 Neither do 
black bears, 
study finds