Fork-tailed Sunbird

The fork-tailed sunbird (Aethopyga christinae) is a bird in the family Nectariniidae. The species was first described by Robert Swinhoe in 1869. It is found in China, Hong Kong, Laos, and Vietnam. Its natural habitat is subtropical or tropical moist lowland forests. These small birds, with decurved bill, call a soft and frequent "zwink-zwink" and a metallic trill. The bird appears in the most commonly used postal stamp of Hong Kong. (Wikipedia, general species account).

Sunbirds and spiderhunters feed principally on nectar and small arthropods, probing flowers with slender bills and sometimes taking insects by gleaning or short aerial pursuits. They can act as pollinators while moving between flowering plants. Plumage often differs between the sexes. These are family-level traits and should not be read as precise Vietnam-specific breeding information (general Nectariniidae ecology). Regional observations can refine these broad expectations.