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The quadratojugal is a small jaw bone that is present in most amphibians, reptiles and birds, but has been lost in mammals. It is connected to the jugal as well as other bones, though these may vary with species.
- Lecointre, Guillaume; Le Guyader, Hervé (2006). The tree of life: a phylogenetic classification. Harvard University Press, 2006. p. 380. ISBN 9780674021839. Retrieved December 10, 2011.
- Schwenk, Kurt (2000). Feeding: Form, Function and Evolution in Tetrapod Vertebrates (1st ed.). Academic Press. p. 537. ISBN 9780080531632. Retrieved December 10, 2011.
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