UNLIKE MOST WARBLER SPECIES, THE MALE AND FEMALE BLUE-WINGED WARBL...

895.Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart. (A) Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart. (B) Unlike most warbler species, the gender of the blue-winged warbler is very difficult to distinguish. (C) Unlike those in most warbler species, the male and female blue-winged warblers are very difficult to distinguish. (D) It is very difficult, unlike in most warbler species, to tell the male and female blue-winged warbler apart. (E) Blue-winged warblers are unlike most species of warbler in that it is very difficult to tell the male and female apart.