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n.1.(Arch.) An interior angle or notch cut across a piece of timber, for the reception of the edge of another, as that in a rafter to be laid on a plate; - commonly called crow's-foot in the United States.
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A bird's-mouth spreads the load of the rafter over a larger part of the top wall and gives you a much larger area for connecting the rafters to the walls.
If the ridge and bird's-mouth cuts fit tight, label one of the rafters as a pattern and use it to mark the remaining 2x4s for cutting.
Then temporarily place an end rafter that has a bird's-mouth notch, and mark the posts for cutoff flush with the top of the rafter.