Ian Carter, a co-author of the report and an ornithologist for Natural England, told the Guardian: 「any time you add any kind of weight to a bird, it will have some kind of effect.」
Matt Murphy, ornithologist for the Countryside Council for Wales said climate change was affecting the breeding patterns of pied flycatchers living in Welsh oak woodlands.
And Japanese ornithologist Satoe Kasahara says that lately kingfishers have snatched fish from urban ponds in her country.
日本鸟类学家佐藤笠原(SatoeKasahara)表示在日本也发现过翠鸟在城市里的水塘捕鱼。
An ornithologist is a professional birder with advanced scientific training about not only bird species but also about behavior, anatomy, physiology and bird species history.