This is Scientific American — 60-Second Science. I'm Emily Schwing. "Over the last few decades, Canada geese have been wintering further and further north, which was interesting, because the winters have gotten a little more mild over the last few years, but still it's pretty cold out there and there's still snow." University of Illinois ornithologist Mike Ward. "So you even would wonder why these geese are deciding to spend the winter in Chicago, when they could have the opportunity to fly down to Arkansas, Louisiana, somewhere warmer." Geese who continue south often land in agriculture fields and other wide open areas. Which makes them visible to hunters in those states, who can bag the birds until the end of January. "There's definitely a lot of geese not just staying there winters in Chicago, but lots of urban areas throughout the Midwest and one reason they are doing that is they are trying to avoid hunters, it looks like."Of course, staying in cities is no easy life either. 这里是科学美国人——60秒科学。我是埃米莉·施温。 “过去几十年来，加拿大雁过冬的地方越来越靠北，这一点值得注意，因为最近几年的冬季虽然稍微温和了一些，但依然很冷，而且也会下雪。” 伊利诺伊大学的鸟类学家迈克·沃德说。 “你可能会想，为什么这些大雁决定在芝加哥过冬？它们明明有机会向南飞到阿肯色州和路易斯安那州等更温暖的地方。” 那些依旧往南飞的大雁经常栖息在农田或其他开阔区域。这使它们很容易被这些州的猎人发现，而猎人直到1月底都还能捕捉到大雁。 “肯定有很多大雁不只待在芝加哥，还会活跃在中西部地区的多个城区，它们这样做的其中一个原因好像是它们在试图避开猎人。” 当然，在城市栖息也不容易。