The Family Hemiprocnidae consists of treeswifts, small to medium-sized birds closely related to true swifts (family Apodidae). Treeswifts are characterized by slender bodies, long wings, and forked tails, which make them agile fliers. Unlike true swifts, they have perching adaptations, allowing them to rest on tree branches rather than clinging to vertical surfaces. They feed primarily on flying insects, catching them in midair, and are found in forested regions across Southeast Asia and the Indo-Pacific. Their nesting behavior is unique: they build small, delicate cup nests on tree branches, often reinforced with saliva and plant material.