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Bullock's oriole (Icterus bullockii) is a small New World blackbird. At one time, this species and the Baltimore oriole were considered to be a single species, the northern oriole . This bird is named after William Bullock , an English amateur naturalist .
The northern oriole (Icterus galbula), considered a species of North American bird from 1973 to 1995, brought together the eastern Baltimore oriole, Icterus galbula, and the western Bullock's oriole, Icterus bullockii. Observations of interbreeding between the Baltimore and the Bullock's oriole led to this classification as a single species.
The male Baltimore oriole song is a clear whistle with a vibrant tone that flows and includes a brief sequence of notes that are paired and repeated 2-7 times, lasting 1-2 seconds. Sometimes during breeding season mature male orioles will make a " flutter-drum sound" to each other while in flight by making noise as they move their wings.
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The song of the hooded oriole tends to be short and abrupt. The notes are rapid and lack the whistling nature of many other oriole species, and often sound nasal and whiny in nature. [6] There is a high amount of variation both geographically and individually within the song of the hooded oriole. Each male also sings many different types of songs.
The song is rarely heard, and is a series of high-pitched whistles. [11] The song is usually given after dawn, but is almost never heard in the daytime, which is similar to the Puerto Rican oriole (Icterus portoricensis). [12] It is known that females of other oriole species sing, but songs by female Hispaniolan orioles have not been identified.
Yellow oriole: Icterus nigrogularis: northern South America in Colombia, Venezuela, Trinidad, the Guianas and parts of northern Brazil, (northern Roraima state, and eastern Amapá) Bullock's oriole: Icterus bullockii: as far north as British Columbia in Canada and as far south as Sonora or Durango in Mexico Streak-backed oriole: Icterus pustulatus
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