Two birds contributing to the same song, taking a different part of each .
- ^ a b Simpson & Day (1999). A Field Guide to the Birds of Australia, 6th Edition. Penguin. ISBN 0-691-04995-5.
|| This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.
|| This article is part of Project Bird Behaviour, a All Birds project that aims to write comprehensive articles on each behavioural term related to birds.
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