Common Teal

Several couples of common teals.
The common teal is the smallest extant dabbling duck at 20–30 cm (7.9–11.8 in) length and with an average weight of 340 g (12 oz) in drake (males) and 320 g (11 oz) in hens (females). The wings are 17.5–20.4 cm (6.9–8.0 in) long, yielding a wingspan of 53–59 cm (21–23 in). The bill measures 3.2–4 cm (1.3–1.6 in) in length, and the tarsus 2.8–3.4 cm (1.1–1.3 in).
Aside from the large green wing patch which gives this species its name, the male Green-winged Teal is characterized by a reddish-brown head, green head patch, gray-brown back, speckled-brown breast and yellow under-tail patches. Females are drab-brown overall with a smaller green wing patch, but may be recognized as teals by their small size.
Common teals every winter form monogamous couples.