How to identify the American Tree Sparrow

To correctly identify the American Tree Sparrow (Spizella arborea), check each of these features. Birds can be tricky: habit, habitat, and call often confirm a sighting that a single photo cannot.

Size at a glance

Length

12.5-16 cm (4.9-6.3 in)

Wingspan

20-25 cm (7.9-9.8 in)

Weight

13-28 g (0.46-0.99 oz)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Adults have a rusty-red cap and a rusty eye-line. The back is streaked brown and black, with two prominent white wing bars. The underparts are grayish-white, with a distinctive dark central breast spot (often described as a 'stickpin' or 'inkblot'). The flanks are washed with buffy-brown streaking. The rump is grayish-brown.

2. 2

   Beak shape

   Shape and color of the bill: a key field mark.

   Conical, finch-like bill. Bicolored: the upper mandible is dark (blackish), and the lower mandible is bright yellow or yellowish-orange.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown.

4. 4

   Leg color

   Leg and foot color.

   Dark gray to blackish.

5. 5

   Distinguishing features

   Standout features that separate this species.

   Rusty cap, rusty eye-line, bicolored bill (dark upper, yellow lower), and a single dark central breast spot.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juveniles are similar to adults but have a streaked crown (lacking the solid rusty cap) and more extensive streaking on the breast and flanks, often obscuring the central breast spot. Their bill may be less distinctly bicolored.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes; plumage remains consistent year-round, though fresh plumage in fall may appear slightly brighter.

8. 8

   Sexual dimorphism

   How males and females differ.

   Males and females are outwardly identical in plumage.

Key field marks

• Rusty Cap. Look for the distinct rusty-red cap on the head. This is a key field mark for adults.
• Bicolored Bill. Observe the bill color: dark (blackish) on the upper mandible and bright yellow or yellowish-orange on the lower mandible. This is unique among North American sparrows with rusty caps.
• Central Breast Spot. Scan the grayish-white breast for a single, small, dark spot in the center. This 'stickpin' mark is often subtle but diagnostic.
• Rusty Eye-line. Note the rusty stripe extending from the eye towards the back of the head, contrasting with a grayish face.
• White Wing Bars. Two clear white wing bars are visible on the dark wings.
• Behavior. Watch for its ground-foraging behavior, often scratching with both feet simultaneously, and its tendency to form flocks in winter.
• Song/Call. Listen for its sweet, tinkling song (breeding season) or its sharp, metallic 'tseet' call (year-round).

Explore the American Tree Sparrow