マダガスカルチュウヒダカ 対 マダガスカルカッコウハヤブサ

要点

The most reliable field mark to separate Madagascar Harrier-Hawk from Madagascar Cuckoo-Hawk is the tail pattern: Harrier-Hawk shows a single broad grey band bisecting a black tail, while Cuckoo-Hawk has two narrow pale bars and a pale tip on a brown tail. In flight or perched, Harrier-Hawk appears larger and greyer with a distinct grey hood and dense barring below, whereas Cuckoo-Hawk is browner above with a paler head, off-white rump, and heavy brown streaks on the breast. Juvenile Cuckoo-Hawks are darker with white-tipped feathers, a feature not shown by Harrier-Hawk. Both are medium-sized raptors endemic to Madagascar, but their structure and plumage details are consistently different.

識別のコツ

1. Tail pattern (all ages): Look for a single broad grey band bisecting a black tail on Madagascar Harrier-Hawk; Cuckoo-Hawk shows two narrow pale bars and a pale tip on a brown tail. This is often visible in flight and when perched.
2. Upperparts color (adults): Harrier-Hawk is grey above with blackish flight feathers, while Cuckoo-Hawk is dark brown above, paler on the head, and has an off-white rump.
3. Underparts pattern (adults): Harrier-Hawk shows dense, regular dark barring on the white underparts, especially breast, belly, and underwing coverts. Cuckoo-Hawk has heavy brown streaks on the breast and sides, with streaks becoming finer on the flanks, not barring.
4. Head and face (adults): Harrier-Hawk has a grey hood and a conspicuous yellow face; Cuckoo-Hawk's head is paler brown with no hood, and the face is less striking.
5. Crest (adults, perched): Cuckoo-Hawk often shows a short crest projecting from the rear crown when perched, absent in Harrier-Hawk.
6. Juvenile Cuckoo-Hawk: Juveniles are darker overall with obvious white tips to the upperpart feathers, creating a scaly look above. Harrier-Hawk juveniles are not described as showing this feature.
7. Underwing pattern (flight): Harrier-Hawk's underwing coverts are densely barred, matching the underparts, while Cuckoo-Hawk's underwing coverts are heavily barred with brown and the flight feathers show broad dark bands.
8. Bill and legs: Harrier-Hawk has a yellow bill with a black tip and yellow legs, which can be seen at close range; these features are not specified for Cuckoo-Hawk.
9. Structure: Harrier-Hawk is bulkier, with longer, broader wings and a longer tail that almost matches the wing length when folded. Cuckoo-Hawk is more compact, with a shorter tail and wings.
10. Size impression: Harrier-Hawk appears larger and more elongated, especially in flight. Cuckoo-Hawk is smaller and more accipiter-like.
11. Rump color: Cuckoo-Hawk has an off-white rump, contrasting with the rest of the upperparts; Harrier-Hawk's rump is not described as contrasting.
12. Perched jizz: Harrier-Hawk sits upright and looks long-winged and long-tailed; Cuckoo-Hawk often appears shorter-tailed and may show its crest.
13. Flight jizz: Harrier-Hawk's flight is likely more buoyant and soaring due to its long wings, while Cuckoo-Hawk may look more direct and accipiter-like.
14. Facial skin: The yellow face of Harrier-Hawk is a strong mark at close range; Cuckoo-Hawk lacks this feature.
15. Sexes: Both species have similar plumage in males and females, so sex is not a useful field mark.

大きさ

Both species are medium-sized raptors, but the Madagascar Harrier-Hawk is bulkier and has longer, broader wings that nearly reach the tail tip when folded. The Madagascar Cuckoo-Hawk is slightly smaller and more compact, with a length of about 300 mm (12 in) and a wingspan of 850 mm (33 in) [wikipedia]. There is no direct measurement for Harrier-Hawk in the provided notes, but its proportions are notably larger and more elongated in the field.

羽色

• Juvenile/immature birds: Juvenile Madagascar Cuckoo-Hawks are darker than adults, with white tips to the upperpart feathers, making the contrast against the dark back obvious. This is not seen in Harrier-Hawk juveniles (no juvenile description provided, but adults are not described as showing this pattern).
• Adults: Madagascar Harrier-Hawk is grey above with blackish flight feathers and a black tail with a single broad grey band. Underparts are white with dense dark barring on the breast, belly, and underwing coverts. The upper breast and throat are grey, forming a hood, and the face is yellow. Madagascar Cuckoo-Hawk adults are dark brown above, paler on the head, with an off-white rump. Underparts are white with heavy brown streaks on the breast and sides, becoming finer on the flanks. The tail is brown with two narrow pale bars and a pale tip. Underwing coverts are heavily barred with brown, and the flight feathers have broad dark bands below. A short crest is visible at rest on the Cuckoo-Hawk.

行動

No direct behavioral differences are detailed in the notes. Both are raptors, but Harrier-Hawk's longer wings and tail may give it a more buoyant, soaring flight compared to the more compact Cuckoo-Hawk, which may appear more accipiter-like and is often noted for its short crest when perched.