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What do you call two birds in love?
Interesting Fact: Only a few female North American songbirds sing, but the female Northern Cardinal does, and often while sitting on the nest. This may give the male information about when to bring food to the nest. A mated pair shares song phrases, but the female may sing a longer and slightly more complex song than the male. ( http://www.allaboutbirds.org/guide/Northern_Cardinal/lifehistory )