Eurasian Wren
Troglodytes troglodytes
The Eurasian wren is a plump, sturdy bird with rounded wings and a short tail, which is usually held cocked up. It is 9 to 10 cm (3.5 to 3.9 in) in length and has a wingspan of 13–17 cm (5.1–6.7 in). It weighs around 10 g (0.35 oz). It is rufous brown above, greyer beneath, and indistinctly barred with darker brown and grey, even on the wings and tail. The bill is dark brown and the legs are pale brown, the feet having strong claws and a large hind toe. Young birds are less distinctly barred and have mottled underparts.
ID text from Wikipedia, CC BY-SA 4.0

Winter Wren
Troglodytes hiemalis
Small tail is often cocked above its back, and short neck gives the appearance of a small brown ball. Rufous brown above, grayer below, barred with darker brown and gray, even on wings and tail. The bill is dark brown, and the legs are pale brown. Young birds are less distinctly barred. Most are identifiable by the pale "eyebrows" over their eyes. Measurements: Length: 8–12 cm (3.1–4.7 in) Weight: 8–12 g (0.28–0.42 oz) Wingspan: 12–16 cm (4.7–6.3 in)
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Eurasian Wren and Winter Wren.