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Aves
2
Canada
2
Feeding rate
2
Hirundinidae
2
Nest-sanitation rate
North America
2
Ontario [Canada]
2
Parental care
2
Parental investment
2
Tachycineta
2
Tachycineta bicolor
2
Tachycineta leucorrhoa
2
asymmetry
2
feeding behavior
2
nest
2
nestling
2
parental care
2
parental investment
2
passerine
2
sanitation
2
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1
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2