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Directional selection on directional asymmetry: testes size and secondary sexual characters in birds

Proceedings of the Royal Society of London. Series B: Biological Sciences, 1994
A standard example of directional asymmetry with one side of the body having a larger character value than the other is testes size in many vertebrates. The relation between directional asymmetry in testes size and the expression of secondary sexual characters (a measure of phenotypic quality) in two bird species, the barn swallow, Hirundo rustica, and
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Transoceanic bird migration: Evidence for detection of wind direction

Behavioral Ecology and Sociobiology, 1980
Further analysis of radar tracks of migrating birds over the Atlantic Ocean (Larkin et al., 1979) indicates that birds sometimes fly at lower air speeds when winds are in the direction of flight than in crosswinds or head winds. The birds are able to estimate wind direction over open ocean by a mechanism which is presently open to speculation.
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The birds have nested: design direction for informal settlements

URBAN DESIGN International, 1996
In most cities of the developing world, informal settlements are both the most common residential context and the dominant means of obtaining housing. Since many of these cities are rapidly approaching ‘megacity’ status, the issue of informal settlements becomes striking in its enormity.
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The Birds Directive

Review of European Community & International Environmental Law, 1997
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Directional Selection and Clutch Size in Birds