"Cats should never be left alone on balconies without having a pet door or some other way of getting back inside the home," Sonja Olson, a senior clinician in emergency medicine for BluePearl Veterinary Partners, tells The Dodo. "If your cat spends a lot of time on a balcony, it's best to have the balcony screened-in if that's possible. But even with a screened-in balcony, cats should not be left alone there without a way of getting back inside. The heat or cold could be too much for them."
(The same goes, of course, for dogs.)
Also, think about what other, bigger animals could be passing through the neighborhood. Not all of them possess the sublime sense of chill of this bald eagle.