Orange-necked Partridge

Little is known about this partridge's behaviour. The territorial calls are a repeated, accelerating prruu, becoming pwi at higher pitches, and also a series of fast tu notes. In duets, the other bird responds with tchew-tchew-tchew. The alarm call is a pher or phu.

The orange-necked partridge is found in southern Vietnam and a small area in Mondulkiri, Cambodia. It lives in forest in hills at elevations of 120–600 m (390–1,970 ft), preferring bamboos. It also occurs in some disturbed habitats, including scrubs, bamboos and logged plantations. In Vietnam, it occurs in several national parks and state forest enterprises. All of the individuals recorded in a 2005 survey lived less than 2 km (1.2 mi) from water.

After its discovery in 1927, the orange-necked partridge was "lost" until its 1991 rediscovery in Cát Tiên National Park. Subsequent surveys have found it in several sites in Vietnam, possibly because of improved survey techniques. It was first recorded in Cambodia in 2002, using a camera trap, and later records in Cambodia have all been in the same site. The IUCN assessed it as a critically endangered species, downlisting to endangered in 2000 and to near threatened in 2009. The population is estimated to be nearly 10,000. It is threatened by logging, forest clearance and hunting. The population is declining, but the decline is probably not rapid because the bird seems to tolerate some forest degradation, so it is assessed as near threatened even though its population and range are both small. In 2000, the orange-necked partridge appeared on a national stamp of Vietnam.