Thick-billed Green Pigeon - BirdForum Opus

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Photo by jweeyh
Photo taken: Manmdai Road, Singapore.

Identification

27cm. Male: Thick, red-based, pale greenish bill, broad green eyering, grey crown, maroon above, green below. Female: No maroon above

T. c. nipalensis: south-central Nepal eastward through Yunnan in China and northern Vietnam, southward through northern Eastern Ghats of northeastern Peninsular India, southern Thailand, and southern Vietnam
T. c. hainanus: Hainan, central Guangdong, and Hong Kong
T. c. curvirostra: Peninsular Malaysia, Sumatra, Riau and Lingga archipelagoes, Borneo, Palawan, and Mindoro (southwestern Philippines)
T. c. haliplous: Simeulue (off northwestern Sumatra)
T. c. pegus: Nias (off northwestern Sumatra)
T. c. smicrus: Batu and Mentawai Islands (off west-central Sumatra)
T. c. hypothapsinus: Enggano (off southwestern Sumatra)

This is a monotypic species[1]. Clements recognizes these subspecies[1]:

Moist lowland forests and mangrove forests.

Clements, J. F., P. C. Rasmussen, T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, M. Smith, and C. L. Wood. 2024. The eBird/Clements checklist of Birds of the World: v2024. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
Gill, F, D Donsker, and P Rasmussen (Eds). 2024. IOC World Bird List (v 14.2). Doi 10.14344/IOC.ML.14.2. http://www.worldbirdnames.org/

GSearch checked for 2020 platform.1