The Sumatran Leafbird is a species of bird

Bird

Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

 in the Chloropseidae family. It is endemic to forest and plantations in Sumatra

Sumatra

Sumatra is an island in western Indonesia, westernmost of the Sunda Islands. It is the largest island entirely in Indonesia , and the sixth largest island in the world at 473,481 km2 with a population of 50,365,538...

 in Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

. It has often been included as a subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 of the Golden-fronted Leafbird

Golden-fronted Leafbird

The Golden-fronted Leafbird is a species of leafbird. It is a common resident breeder in India, Sri Lanka, and parts of Southeast Asia. It often includes the Sumatran Leafbird from Sumatra as a subspecies, but the two differ extensively in, among others, morphology.Its habitat is forest and scrub...

 (C. aurifrons), but the two differ extensively in, among others, morphology

Morphology (biology)

In biology, morphology is a branch of bioscience dealing with the study of the form and structure of organisms and their specific structural features....

, with the male of the Sumatran Leafbird having a yellow (not deep orange) forehead, and the female resembling a female Blue-winged Leafbird

Blue-winged Leafbird

The Blue-winged Leafbird is a species of leafbird found in forest and second growth from far north-eastern India and throughout Southeast Asia as far east as Borneo and as far south as Java. It commonly includes Jerdon's Leafbird from the Indian Subcontinent, and the Bornean Leafbird The...

, but with a yellowish forecrown and no blue to the wings and tail (very different from the Golden-fronted Leafbird, where the male and female are very similar).