Studies in the Life History of the Song Sparrow, Parte 1

17 days activities adult animals appear April average awakening song banded Barn Swallow behavior Bird-Banding birds brood Bunting cage cent Chapter civil twilight Columbus Common Redstarts copulation Corvidae Cowbird Cowbird eggs days old dominance early eggs European Robin February feeding female Song Sparrow fighting fledged flock hand-raised birds hatched Heinroth Horned Lark House Sparrow House Wren incubation individual instinctive Interpont June later laying leaving the nest Lorenz loud male Song Sparrows mate meters migration migratory minutes neighbors nestlings Nice normal number of young Ovenbird pair parents passerines pecking percentage period population pouncing predators reaction records Redstarts Robin sang sexual showed shown singing Snow Bunting social Song Spar Song Sparrows species spring stage Starlings summer resident survival Table tchunks temperature territory Thrasher Tinbergen trap Tree Swallows Warbler warbling weather weight wings winter Wren young birds