Definition: The term "vespertilionidae" is a genus of birds in the family Troglodytidae. These birds belong to the order Cetacea and are primarily found in the western Pacific Ocean, from Japan to Taiwan. The genus name, "vespertilion," means "night-flying," as they have feathers that are adapted for flight at night. The specific epithets, "idai" (meaning "night") and "idae" (meaning "