アフリカツミ 対 サバンナハイタカ

The most reliable field mark between Little Sparrowhawk and Ovambo Sparrowhawk is size: Little Sparrowhawk is much smaller and daintier, with a notably shorter wingspan and lighter build. In the field, adult Little Sparrowhawks show two white spots on the underside of the central tail feathers and a narrow white rump patch, while Ovambo Sparrowhawks have a broader tail with three dark bars and a bold subterminal band, plus a white-barred rump. Juveniles of both are browner, but Little Sparrowhawk juveniles show spotted (not barred) underparts and only white tips on rump feathers, while Ovambo juveniles may have rufous or white underparts and a brown head. Eye, cere, and leg color also differ: Little Sparrowhawk adults have deep yellow eyes and yellow legs, while Ovambo Sparrowhawk adults have dark red eyes, orange legs, and a red cere. Structure and flight jizz are also helpful: Little Sparrowhawk is more compact and delicate, while Ovambo Sparrowhawk is bulkier and longer-winged.

1. Size is the quickest separator: Ovambo Sparrowhawk is nearly twice the mass and much longer-winged than Little Sparrowhawk. If you get a clear sense of scale, this is decisive.
2. Tail pattern in flight: Little Sparrowhawk adults show two white spots on the underside of the central tail feathers; Ovambo Sparrowhawk has three dark tail bars and a broad subterminal band, lacking the white spots.
3. Rump patch: Little Sparrowhawk shows a narrow white lower rump patch (adults); Ovambo Sparrowhawk has a white-barred rump, which may appear more extensive and less sharply defined.
4. Underpart barring: Little Sparrowhawk males have fine rufous barring below; females have broader, browner barring. Ovambo Sparrowhawk adults have fine grey barring on white underparts and a plain white vent—never rufous.
5. Juvenile underparts: Little Sparrowhawk juveniles are spotted with brown below (not barred); Ovambo juveniles may be white or rufous below, sometimes with a brown head, and barring is variable.
6. Upperpart color: Little Sparrowhawk males are dark grey (almost black) above; females and juveniles are browner. Ovambo Sparrowhawk adults are plain grey above, never as dark as male Little Sparrowhawk.
7. Eye color: Adult Little Sparrowhawk has deep yellow eyes; Ovambo Sparrowhawk adults have dark red eyes. Juvenile Little Sparrowhawk has brown eyes; check age carefully.
8. Cere and leg color: Little Sparrowhawk adults have yellow cere and legs; Ovambo Sparrowhawk adults have red cere and orange legs. Juvenile Little Sparrowhawk has a yellowish-green cere.
9. Bill: Both have black bills, not a useful separator.
10. Flight jizz: Little Sparrowhawk is compact, short-winged, and agile; Ovambo Sparrowhawk is bulkier, longer-winged, and may appear more powerful in flight.
11. Melanistic form: Only Ovambo Sparrowhawk has a melanistic (all-black) morph (with white-barred underwing flight feathers), which is never shown by Little Sparrowhawk.
12. Sexual dimorphism: Both species show some sexual dimorphism, but the color differences (grey vs brown) are more pronounced in Little Sparrowhawk.
13. Ventral vent: Ovambo Sparrowhawk has a plain white vent, which can be a subtle but useful mark in adults.
14. White on tail: Only Little Sparrowhawk shows two white spots on the underside of the central tail feathers—look for this in perched or flying birds.
15. Context: If you are in an area where both occur, always check size first, then tail and rump pattern, then soft part colors. If only one is expected, be careful with juveniles, as both can appear brown and streaky.

Ovambo Sparrowhawk is much larger and heavier than Little Sparrowhawk. Ovambo averages about 192.5 g in body mass (adult), with a length of about 30 cm and a wingspan of 67 cm. Little Sparrowhawk is significantly smaller, with a length of 23–27 cm and a wingspan of 39–50 cm; males weigh 74–85 g and females 68–105 g. In direct comparison, Ovambo Sparrowhawk is nearly twice as heavy and much longer-winged, making size a strong field clue if seen together or with a good sense of scale.

• Juveniles: Little Sparrowhawk juveniles are browner above with pale tips to upperpart feathers, underparts are spotted with brown (not barred), and rump feathers have only white tips. Ovambo Sparrowhawk juveniles are also brown above, but underparts may be white or rufous, and the head may be brown; barring is less consistent, and some show rufous below.
• Adults: Little Sparrowhawk males are dark grey above (almost black), with white throat and fine rufous barring below; females are browner above and have broader, browner barring. Both sexes show two white spots on the underside of the central tail feathers and a narrow white lower rump patch. Ovambo Sparrowhawk adults are plain grey above, white below with fine grey barring (not rufous), and a plain white vent. The tail has three dark bars and a broad, dark subterminal band, and the rump is white-barred. Ovambo also has a melanistic form (all black except for white-barred underwing flight feathers), which Little Sparrowhawk lacks.
• Soft parts: Little Sparrowhawk adults have deep yellow eyes, yellow legs, and a yellow cere; juveniles have brown eyes and a yellowish-green cere. Ovambo Sparrowhawk adults have dark red eyes, orange legs, and a red cere.

Both are typical small Accipiter-type raptors, but Ovambo Sparrowhawk, being larger and longer-winged, may appear more powerful and less fluttery in flight. Little Sparrowhawk, being smaller and more delicate, often appears more agile and compact, with rapid wingbeats and quick, darting movements. Both perch in cover and can be secretive, but the larger Ovambo may be more likely to soar or be seen in more open situations.