The yellow-rumped warbler was formerly split into two species (myrtle and Audubon's warblers), but in 1973 it was reclassified as a single species. "Myrtle" and "Audubon's" warblers have largely allopatric ranges but hybridize where they are sympatric in the Canadian Rockies. They are similar in appearance but are readily distinguished by experienced birders. What further data about these two forms should ornithologists collect and analyze in order to decide whether they should continue to be classified as a single species?

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The Answer of The yellow-rumped warbler was formerly split into two species (myrtle and Audubon's warblers), but in 1973 it was reclassified as a single species. "Myrtle" and "Audubon's" warblers have largely allopatric ranges but hybridize where they are sympatric in the Canadian Rockies. They are similar in appearance but are readily distinguished by experienced birders. What further data about these two forms should ornithologists collect and analyze in order to decide whether they should continue to be classified as a single species?

The Yellow-Rumped Warbler Was Formerly Split into Two Species (Myrtle