Zonerodius heliosylus


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Zonerodius heliosylus
Species Authority: (Lesson, 1828)
Common Name(s):
English Forest Bittern

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Beehler, B., Bishop, P., Burrows, I., Burrows, R., Gibbs, D. & Mack, A.
Facilitator/Compiler(s): Benstead, P., Derhé, M., Dutson, G., Mahood, S., O'Brien, A., Pilgrim, J.
This species qualifies as Near Threatened because it has a moderately small population which is thought to be undergoing a moderate decline owing to habitat degradation.

Geographic Range [top]

Range Description: Zonerodius heliosylus occurs throughout New Guinea (Papua, formerly Irian Jaya, Indonesia and Papua New Guinea) and on the adjacent islands of Salawati and Aru, Indonesia. There are very few recent records and it is such a reclusive species that it is impossible to assess its true population (Coates 1985, Beehler et al. 1986, K. D. Bishop in litt. 1994, D. Gibbs in litt. 1994, Eastwood 1998).

Indonesia; Papua New Guinea
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Fewer than 10,000 individuals are estimated to survive (unpublished information supplied by Wetlands International Specialist Groups), so it is placed in the band 2,500-9,999 individuals here. This equates to 1,667-6,666 mature individuals, rounded here to 1,500-7,000 mature individuals.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It frequents streams, pools and swamps in forest to 1,430 m.

Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): Although it is not hunted (B. M. Beehler in litt. 1994) and there are still huge areas of suitable habitat left, it may be threatened by the extensive logging of lowland forest (I. Burrows in litt. 1994, R. Burrows in litt. 1994), especially as it occurs along watercourses (A. Mack in litt. 1999).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
None is known.

Conservation Actions Proposed
Survey to better understand the abundance and distribution of the species. Protect large areas of lowland rainforest. Ensure protection of forests along watercourses.

Citation: BirdLife International 2012. Zonerodius heliosylus. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 05 September 2015.
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