| http://www.w3.org/ns/prov#value | - We have studied extra-pair mating in birds extensively, using genetic markers to identify extra-pair offspring and their actual parents in 18 species of birds ranging from Humboldt penguins, common loons and shorebirds to migratory songbirds such as swamp sparrows, warblers, kingbirds, and phainopeplas.
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