ue-winged Warblers and Golden-winged Warblers have distinct feather coloration. he two species readily interbreed to produce fully fertile viable offspring, they oduce similar nests, eat similar food resources, and only differ by a few alleles in eir genome, but they are considered different species. Under which species ncept can you justify the fact that they are different species? Biological and morphological species concepts Biological, ecological, and morphological Morphological species concept Ecological species concept Biological species concept