リュウキュウヨシゴイ vs Gray-shanked Douc Langur

Ixobrychus cinnamomeus compared with Pygathrix cinerea

Key Differences

• リュウキュウヨシゴイ is Least Concern while Gray-shanked Douc Langur is Critically Endangered.

Taxonomic Classification

Rank	リュウキュウヨシゴイ	Gray-shanked Douc Langur
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Aves (鳥類)	Mammalia (哺乳類)
Order	Pelecaniformes (ペリカン目)	Primates (サル目)
Family	Ardeidae	Cercopithecidae (Old World Monkeys)
Genus	Ixobrychus	Pygathrix
Species	Ixobrychus cinnamomeus	Pygathrix cinerea

Evolutionary Relationship

リュウキュウヨシゴイ and Gray-shanked Douc Langur share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

リュウキュウヨシゴイ

LC — Least Concern

Gray-shanked Douc Langur

CR — Critically Endangered

Physical Characteristics

Attribute	リュウキュウヨシゴイ	Gray-shanked Douc Langur
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

リュウキュウヨシゴイ

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Distributed across Norway and Taiwan.

Gray-shanked Douc Langur

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

リュウキュウヨシゴイ

The cinnamon bittern (Ixobrychus cinnamomeus) is a small heron in the family Ardeidae, widely distributed across South and Southeast Asia, from Pakistan and India east through Southeast Asia to China, Japan, and the Philippines, south through Indonesia and Papua New Guinea. It inhabits wetlands including rice paddies, reedbeds, marshy grasslands, and the margins of ponds and rivers, where it stalks prey in dense emergent vegetation. The plumage is entirely cinnamon-brown in males, while females are more streaked. Like other small bitterns, it has a cryptic freezing posture—stretching its neck vertically to blend with reeds—when alarmed. The cinnamon bittern is classified as Least Concern by the IUCN, with a widespread and abundant Asian distribution. It is entirely absent from Europe; database records citing Norway are data artifacts. This species is highly tolerant of rice cultivation and degraded wetlands, making it one of the more adaptable Asian herons. However, wetland loss from drainage and intensification of rice agriculture across South and Southeast Asia poses long-term threats to wetland species broadly. The cinnamon bittern is a shy and secretive bird that is more often heard—giving a deep, booming call—than seen in its dense wetland habitat.