I think that is a price we pay for placing our plants outside. When I had vandas on my deck, I had hummingbirds in them. At least they didn't eat the flowers or buds.
It's the weirdest thing...this is the one and only plant showing any signs of being munched on! I've since put bonemeal down around the legs of the rack this one is on so whatever managed to crawl all the way up there the first time doesn't have a second chance.