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... Female song is uncommon in birds.

— David Lack The Life of the Robin (1943)

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More quotes by David Lack

... 'duetting' is uncommon in birds, but has been recorded for various tropical species.

Swifts in a Tower (1956)

... many large insects come out at dusk. By doing so they escape many enemies, but not all, since here the nightjar tribe takes over, many of which are larger than the largest swifts.

Swifts in a Tower (1956)

... It is uncommon among birds for the female to be as brightly coloured as the male. ... A brightly colored female would be much more dangerous for a species which nested in the open.

The Life of the Robin (1943)

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Quote text and notes from Wikiquote: David Lack (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.