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Welcome to the BirdForum Opus
The interactive birding encyclopaedia

Welcome to the Opus, an interactive, multimedia encyclopaedia that anyone can edit. You can use the Opus to find out about everything to do with birds - from the birds themselves to the places you can find them.

Featured Article: House Sparrow
Photo © by mali

Distribution

Worldwide. Deliberately introduced by man on several continents, this bird is an unwelcome addition to the local ecologies, and another glaring example of the folly of the introduction of an alien species.

Breeding

Nests of grass, wool, feathers and other soft materials are made in holes in buildings or other structures, though house sparrows will also breed in thick ivy and natural structures. The clutch consists of 4-5 glossy pale blue eggs. The young fledge after about 3 weeks.

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If you're looking for a particular bird, place, or anything else related to the birding world, try searching for it using the search box at the top, or to the left, of this page. You can also get an overview of all the birds, bird song, locations or other wildlife by using the tabs above.

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