カオグロシトド 対 シロスジヒメドリ

The most reliable way to separate Harris's Sparrow from LeConte's Sparrow is by size and overall structure: Harris's is much larger and bulkier, with a hefty pink bill, while LeConte's is tiny and delicate with a short, gray bill. In all plumages, Harris's shows a bold black face and bib (especially in adults), whereas LeConte's has a buffy-orange face with gray cheeks and a white central crown stripe. Immature Harris's can be confusing, but still show a larger, chunkier build and more extensive black on the underparts than any LeConte's. LeConte's prefers to stay hidden in grass, while Harris's is more likely to be seen perched up. If you see a sparrow with a big pink bill and obvious black on the face or throat, it's Harris's; if it's a tiny, round sparrow with a buffy face and white crown stripe, it's LeConte's.

1. Size is the fastest check: Harris's Sparrow is much larger and heavier than LeConte's. If the bird looks chunky and big for a sparrow, it's Harris's; if it's tiny and round, it's LeConte's. This works for all ages and seasons.
2. Bill shape and color: Harris's has a large, conical, pink bill (all ages); LeConte's has a short, gray bill. Bill color is especially obvious in adults but size is always helpful.
3. Face and throat pattern: Adult Harris's shows a bold black crown, face, throat, and upper breast, contrasting with gray sides of the head. LeConte's never shows black on the face or throat; instead, look for a buffy yellow-orange face with gray cheeks and a white central crown stripe (all ages).
4. Immature/juvenile confusion: Immature Harris's can show less black, but still has a white chin/throat, black malar stripe, and a broad, smudgy black breast-band. LeConte's never shows a black malar or breast-band, instead has a clean buffy-orange face and streaked sides. If you see any black on the throat or breast, it's Harris's.
5. Crown stripe: LeConte's always has a white central crown stripe bordered by dark brown, visible in all plumages. Harris's crown is black in adults, brownish with black streaks in juveniles, but never shows a clean white central stripe.
6. Underparts: Harris's adults have white underparts with black on upper breast and some black mottling on flanks; immatures have more extensive black below. LeConte's has off-white belly and buffy orange-yellow breast/sides with brown streaks, never black.
7. Back and wing bars: Harris's has a brown back with heavy black streaking and two white wing bars. LeConte's has a back streaked brown and beige, but no distinct wing bars.
8. Tail: Harris's has a long tail; LeConte's has a short, pointed tail. In flight or perched, tail length is a useful clue.
9. Posture and behavior: Harris's is often seen perched up, sometimes in flocks, and is not strictly ground-dwelling. LeConte's is secretive, stays low in dense grass, and rarely perches in the open except when singing.
10. Habitat: Harris's is found in brushy edges, open woodlands, and fields, especially in winter. LeConte's is restricted to dense grasslands and weedy fields, rarely venturing into open or shrubby areas.
11. Song: Harris's sings clear, whistled phrases from high perches; LeConte's song is a buzzy, insect-like trill, often delivered from within grass. If you hear a grasshopper-like buzz, it's LeConte's; clear whistles point to Harris's.
12. Seasonal change: Harris's loses some black in non-breeding plumage, becoming more buffy and brown, but still shows a larger size and bill. LeConte's is similar year-round.
13. Flock context: Harris's may join mixed sparrow flocks in winter and is often the largest sparrow present. LeConte's is usually solitary or in small groups, always in thick grass.
14. Flight flush: LeConte's typically flushes from the ground, flies low, and drops quickly into cover. Harris's is less likely to flush this way and more likely to be seen flying between perches or feeding openly.
15. When in doubt: If you see a sparrow with a pink bill and any black on the face or throat, it's Harris's. If it's tiny, round, with a buffy face and white crown stripe, and no black, it's LeConte's.

Harris's Sparrow is dramatically larger than LeConte's Sparrow. Harris's measures 17–20 cm in length with a wingspan of about 27 cm and a body mass ranging from 26–49 g [wikipedia], making it the largest North American sparrow. LeConte's Sparrow is one of the smallest sparrows, at just 12 cm in length, 18 cm wingspan, and 13.8 g in mass [wikidata]. In the field, Harris's appears large, heavy-bodied, and long-tailed, while LeConte's is tiny, round, and short-tailed. Even at a distance or in mixed flocks, the size gap is striking.

• Juvenile/Immature: Juvenile Harris's Sparrow shows a brownish crown streaked with black and fine dark streaks below, plus some broader black markings on the underside. Immatures have a white chin and throat, a black malar stripe, and a broad, smudgy black breast-band. LeConte's juveniles and immatures are not described in detail, but all ages show a buffy-orange face with gray cheeks, a dark brown crown with a white central stripe, and a streaked back. No age of LeConte's shows black on the face or throat.
• Adult (Breeding): Harris's Sparrow adults have a striking black crown, face, throat, and upper breast, a pink bill, gray sides of head and neck, brown streaked back, and two white wing bars. Underparts are white with some black mottling on the flanks. LeConte's adults have a buffy yellow-orange face, gray cheeks, dark brown crown with a white central stripe, lilac-gray nape with chestnut streaks, and a streaked brown/beige back. Underparts are off-white on the belly, buffy orange-yellow on breast/sides with dark brown streaks.
• Adult (Non-breeding): Harris's becomes more buffy and brown, with reduced black on the head and throat, sometimes with whitish scalloping. LeConte's remains similar year-round.
• Wing pattern in flight: No distinctive upperwing or flight pattern is described for either species that is diagnostic for age or species.

Harris's Sparrow is often seen perched up on shrubs or trees, especially when singing or in winter flocks. It can be found in open areas but is not strictly terrestrial. LeConte's Sparrow is secretive, preferring to stay hidden in tall, dense grasses, and is rarely seen perched in the open except when singing from a grass stem. Harris's is more likely to join mixed sparrow flocks and be visible, while LeConte's is more likely to flush from the ground and drop back into cover.

Harris's Sparrow breeds in northern central Canada and winters in the central Great Plains (southern South Dakota to central Texas), often in open woodlands, shrubby edges, and fields. LeConte's Sparrow breeds in northern grasslands and winters in the southern U.S., always favoring dense, tall grass or weedy fields. If you find a sparrow in open grassland or prairie, especially if it flushes from the ground and disappears into cover, it's more likely LeConte's. Harris's is more likely in brushy, edge, or woodland habitats and is more conspicuous.

Harris's Sparrow sings a series of clear, high, wavering whistles, sometimes followed by another series at a different pitch, and gives a strong metallic 'chink' call as well as musical twittering. LeConte's Sparrow's song is a grasshopper-like buzz with a short squeaky note at the start and a short chirp at the end (tika-zzzzzzzzzzzz-tik), and its call is a short 'tsip.' Harris's song is musical and whistled, while LeConte's is insect-like and buzzy. LeConte's often sings from concealed positions in grass, while Harris's sings from high perches.