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This is Scientific American 60-second science. I'm Emily Schweng.

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 lots of snow.

University of Illinois ornithologist Mike Ward.

So you 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 agricultural fields and other wide open areas, which makes

them visible to hunters in those

states who can bang the birds until the end of January.

There's definitely a lot of geese that are seeing the winters in Chicago, and not just Chicago,

lots of urban areas throughout the Midwest.

And one reason they're doing that is they're trying to avoid hunters, it looks like.

Of course, staying in cities is no easy life either.

It probably would be easier to find food if they would fly somewhere else

to go to cornfield or somewhere else.

But they're hanging out in the city and they're acting very strangely.

...