Eastern bluebirds (Sialia sialis), often referred to as “harbingers of spring,” are small — about 7 inches — cavity nesters often found near meadows. A relative of the robin, this native songbird ...
Clutch size and breeding success was related to nest-box size in 215 nests of Tengmalm's owl in the Kauhava region, western Finland in 1966-82. In vole peak years, but not in other years, mean clutch ...
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