The theme or main point of the conclusion of "a big year" is that a birding is not only about winning a contest.
A theme simply jeans the main idea or the underlying message that can be conveyed in a literary work.
In the story, the birders take great pride in their reputation and the abilities to be able to identify the birds.
In this case, the theme or main point of the conclusion of "a big year" is that birding is not only about winning a contest but rather about having fun.
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