In the winter of Woodchuck, birds move to the warmer region

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This chart shows a partial list of some of the species of birds can be seen in Woodchuck County during two different seasons: summer and winter.

In this list, there are eight kinds of birds reported. Three of the species listed-cardinals, crows and woodpeckers are observed in both winter and summer. It can be explained that they are the original birds in Woodchuck County, not be the migratory birds. Four of the species listed-blue birds, mockingbirds, orioles and vireos are discovered in only summer. This means that they are the migratory birds. In the summer, they migrate to Woodchuck for breeding seasons or avoiding the cold of winter. In the winter of Woodchuck, they move to the warmer region. That may be the reason why they can not be observed here in the winter. There is only juncos living here in the winter. Perhaps they adapted with the cold conditions during their evolution and the winter is the best season for them to inhabit.

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... the species of birds can be seen in Woodchuck County ...

... eight kinds of birds reported .
or
This list reports eight kinds of birds.

It can be explainedThe possible reason of this is that they are the original birds inoriginally from Woodchuck County, so they are notnot be the migratory birds.

..., mockingbirds, orioles, and vireos are discoveredobserved only in only summer.

... are the migratory birds. Inwhich duringthe summer, they migrate to Woodchuck forin order to spend breeding seasons ...

There is only juncos living here in the winter.Juncos is the only species living here during the winter.

Perhaps they adapted themselves with the cold conditions ...