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Birderbirdhouse
Birdie
Birdikin
Birding
Birding piece
Birdlet
Birdlike
Birdlime
Birdling
Birdman
birdnest
birdnesting
Birds Of a Feather
Birdseed
birdseed grass
-- birdsong --
Birdwatch
Birdwatcher
Birdwoman
Birectangular
birefringence
birefringent
Bireme
Biretta
Birgander
Birk
Birken
Birkie
Birl
Birlaw
birle
birling
birdsong
| Noun | 1. |  birdsong - the characteristic sound produced by a bird; "a bird will not learn its song unless it hears it at an early age" |