Physical Description

American tree sparrows are small, grayish-brown birds. They have a rusty-colored crown and a rusty-colored line behind each eye. They have a grey head, chin, throat, breast and belly and a rusty patch on each side of their breast. They also have a dark spot in the middle of their breast. Their tails are long, with a notch in the middle. Their beaks are dark on top and yellow on the bottom. Males and females look about the same. Young American tree sparrows look similar to adults, but have streaking on their sides and their breast.

Adult American tree sparrows weigh 18 to 26 g, and are 14 to 16.5 cm long. Their wingspans range from 21.6 to 24.8 cm.

Range mass: 18 to 26 g.

Range length: 14 to 16.5 cm.

Range wingspan: 21.6 to 24.8 cm.

Other Physical Features: endothermic ; bilateral symmetry ; polymorphic

Sexual Dimorphism: sexes alike