Tips for using Browse:

Browsing is a valuable way to learn about birds, however it is a brute force approach and not designed for identification. A more sophisticated approach to finding a bird with specific field marks is to use the Step by Step Search. You can also try the Wizard to find a bird, which uses a question and answer approach, but again it does not give you the flexibility of the Step by Step Search.

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Eurasian Tree Sparrow
Eurasian Tree Sparrow: Small, introduced sparrow, black-streaked red-brown upperparts, buff underparts, single white wing-bar. Head has chestnut-brown crown, small black mask, chin, ear patches. Swift bounding flight, alternates rapid wing beats with periods of wings pulled to sides.