angry barn swallow protecting her nest in 'bombay hook national wildlife reuge.

green bird animal nature wildlife yellow branch wood leaf beak grass wing blue tree angry barn swall swallow protecting nest 'bombay hook national reuge bombay migratory protection conservation management refuge loss habitat atlantic flyway protects tidal salt marsh mid-atlantic coast delaware bay creek freshwater impoundments upland habitats refuges breeding migrating birds nwr flyway ramsar wetland research natural refuge nationally birding attracting birders state delaware 30