Genus Dacelo refers to a group of birds that are commonly known as kookaburras. These birds are native to Australia and New Guinea, and are best known for their distinctive laughing call. The genus name Dacelo is derived from the Greek word daktylos, which means "finger," and refers to their zygodactyl feet - two toes facing forward and two backward. Synonyms for the genus Dacelo include the scientific names of Dacelo gigas and Dacelo novaeguineae, which are the respective species of the Laughing Kookaburra and Blue-winged Kookaburra. Additionally, the term "tree kingfisher" is sometimes used to describe kookaburras, as they are known to hunt and feed on fish and other small animals from tree branches.