SMART Vocabulary: relevant words and phrases Zoology: ornithology & hen-viewing aerie birder birding birdsong birdwatcher birdwatching eggshell feeding station flighted flightless hover incubate incubation incubator ornithological ornithologist ornithology twitcher twitching学習 「あざとい」ってどんな意味？漢字でどう書く？�