The cinnamon ibon (Hypocryptadius cinnamomeus) is a species of bird endemic to the mountains of Mindanao in the Philippines. Monotypic within the genus Hypocryptadius, it is classified as a sparrow after being tentatively placed in the white-eye family Zosteropidae. Its natural habitat is tropical moist montane forests and mossy forests above 1,000 metres (3,300 ft). It has a skull and bill similar to that of the sparrows, and following a study of its mitochondrial and nuclear DNA as well as skeletal evidence, Jon Fjeldså and colleagues placed the species as the most basal member of that family and a distinct subfamily.
- BirdLife International (2012). "Hypocryptadius cinnamomeus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Fjeldså, J.; Irestedt, M.; Ericson, P. G. P.; Zuccon, D. (2010). "The Cinnamon Ibon Hypocryptadius cinnamomeus is a forest canopy sparrow". Ibis 152 (4): 747–760. doi:10.1111/j.1474-919X.2010.01053.x.
- Cinnamon Ibon media on the Internet Bird Collection
- Video of a Cinnamon Ibon nesting
- Article on the Cinnamon Ibon by Don Roberson
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