What observable feature distinguishes the rump of *Numenius phaeopus* from *N. hudsonicus*?
Answer
The Eurasian Whimbrel (*N. phaeopus*) has a primarily white rump, while the Hudsonian Whimbrel's rump is drab brown
The separation of the Whimbrel populations into two species, *Numenius phaeopus* (Eurasian) and *Numenius hudsonicus* (Hudsonian), relies on observable morphological differences, particularly visible in flight. The Eurasian Whimbrel typically displays a distinct, primarily white rump patch. In contrast, the Hudsonian Whimbrel, native to the Americas, possesses a rump that is drab brown and blends closely with the coloration of the rest of its back plumage. This specific feature is highlighted as a key element for modern identification and classification verification between the two forms.
Related Questions
What does the Ancient Greek root used for the genus *Numenius* refer to?What observable feature distinguishes the rump of *Numenius phaeopus* from *N. hudsonicus*?Which taxonomic Order unites the Whimbrel with gulls and auks?How do members of the Family *Scolopacidae*, including the Whimbrel, typically forage?What do the Ancient Greek words *phaios* and *pous* contribute to the meaning of *phaeopus*?Where do populations of the subspecies *N. p. islandicus* primarily breed?What is the etymological basis for the common name 'Whimbrel'?Which classification status do some authorities still apply to the Eurasian and American Whimbrels?Which subspecies of *N. p. phaeopus* breeds in northeastern Siberia and winters as far east as Australia?What key physical characteristic contributed to the initial placement of the Whimbrel in Class *Aves*?