Absolutely true! Raptors are VERY protective of their nests! I have personally been dived and swooped at and screamed at by protective raptors of many species. Actually scary when they are large like a Red-tailed hawk or Golden eagle.That said.. a nesting mother may attack a drone just for being to close to the nest. So, whether your drone looks tasty or not, it might get a few swoops in an effort to "scare" you off.