When the speaker in Two Tramps Mud Time says Except color he isnt blue to describe bluebird means that?

In the poem "Two Tramps in Mud Time" by Robert Frost, the line "Except color he isn't blue" refers to a bluebird. The speaker is describing the bird's appearance and notes that it is not actually blue in color, despite its name. This line suggests that the bird's name is somewhat misleading, as it is not truly representative of its appearance. The speaker is using this line to draw attention to the often subtle and unexpected aspects of nature, and to encourage the reader to look beyond surface appearances.