The Canadian Tiger Swallowtail (Papilio canadensis) has a shorter wingspan than the Eastern Tiger Swallowtail (P. glaucus) but otherwise looks very similar. Since size can be difficult to judge, subtle visual markers can be used to tell the two apart, but this requires that they sit still for close inspection. The Canadian Tiger Swallowtail's range, which is the more northerly of the two, extends throughout Canada, Alaska, and into parts of the lower 48 states, including northern and western New England. Caterpillars of this species feed on the leaves of various trees, including Quaking and Big-toothed Poplar, Paper Birch, and Black Cherry.
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