Question: A bat, a black bird, wood pecker, turtle dove, and a blue jay were birds used in the song "Leather-Winged Bat" by an American folk group formed in what year?
Context: The Adamawa turtle dove ("Streptopelia hypopyrrha") is a species of bird in the pigeon and dove family Columbidae.  It is also known as the pink-bellied turtle dove.  The species is closely related to and has been considered the same species as the dusky turtle dove.  The species has a disjunct distribution, being native to Cameroon Nigeria and south-west Chad, and further west in Gambia, Senegal and Mali.  It has also been reported defending a territory in Togo, suggesting a population may exist there too. The Oriental turtle dove or rufous turtle dove ("Streptopelia orientalis") is a member of the bird family Columbidae. The blue jay ("Cyanocitta cristata") is a passerine bird in the family Corvidae, native to North America.  It is resident through most of eastern and central United States, although western populations may be migratory.  Resident populations are also found in Newfoundland, Canada, while breeding populations can be found in southern Canada.  It breeds in both deciduous and coniferous forests, and is common near and in residential areas.  It is predominantly blue with a white chest and underparts, and a blue crest.  It has a black, U-shaped collar around its neck and a black border behind the crest.  Sexes are similar in size and plumage, and plumage does not vary throughout the year.  Four subspecies of the blue jay are recognized. Peter, Paul and Mary was an American folk group formed in New York City in 1961, during the American folk music revival phenomenon.  The trio was composed of tenor Peter Yarrow, baritone Noel Paul Stookey and alto Mary Travers.  The group's repertoire included songs written by Yarrow and Stookey, as well as covers written by other folk musicians.  After the death of Travers in 2009, Yarrow and Stookey continued to perform as a duo under their individual names. "Leather-Winged Bat" is a well-known English folk song about a collection of "birds".  The song's most used cast members are usually bat, a wood pecker, a blue bird, owl and turtle dove.  However, depending on the artist, the song can have different creatures.  Such as Peter, Paul and Mary's 1969 version which has a bat, a black bird, wood pecker, turtle dove, and a blue jay.  Each "bird" has something to say about love and courtship in some sort of rhyming manner.  It was recorded by Burl Ives on 31 January 1941 and released in August 1941 on the album "Okeh Presents the Wayfaring Stranger".  It has also been recorded by Pete Seeger, The Duhks, Bill Staines, Spider John Koerner, Peter, Paul and Mary, Kitty White, Nettles, Vicki Neville, Kim Milai, Anne Price and Warren Fremling. The zenaida dove ("Zenaida aurita") is a member of the bird family Columbidae, which includes doves and pigeons.  It is the national bird of Anguilla, where it is commonly (but erroneously) referred to as a turtle dove.  It lays two white eggs on a flimsy platform built on a tree or shrub.  It also nests in rock crevices and on grassy vegetation if no predators are present.  It has been recorded that some birds have up to 4 broods per year.  Eggs take approximately two weeks to hatch, and the young chicks typically fledge after only two weeks in the nest.  Parents feed the young pigeon's milk, a nutrient rich substance regurgitated from its crop. The pinyon jay ("Gymnorhinus cyanocephalus"), historically known as the blue crow or Maximilian's jay, is a jay between the North American blue jay and the Eurasian jay in size.  It is the only member of the genus Gymnorhinus, (monotypic).  Its overall proportions are very nutcracker-like and indeed this can be seen as convergent evolution as both birds fill similar ecological niches.  The pinyon jay is a bluish-grey coloured bird with deeper head colouring and whitish throat with black bill, legs and feet. The California scrub jay ("Aphelocoma californica"), is a species of scrub jay native to western North America.  It ranges from southern British Columbia throughout California west of the Sierra Nevada.  The California scrub jay was once lumped with the island scrub jay, and Woodhouse's scrub jay, collectively called the western scrub jay.  The group was also lumped with the Florida scrub jay; the taxon was then called, simply, the scrub jay.  The California scrub jay is nonmigratory and can be found in urban areas, where it can become tame and will come to bird feeders.  While many refer to scrub jays as "blue jays", the blue jay is a different species of bird entirely.  In recent years, the California scrub jay has expanded its range north into the Tsawwassen region of British Columbia. The mourning dove ("Zenaida macroura") is a member of the dove family, Columbidae.  The bird is also known as the American mourning dove or the rain dove, and erroneously as the turtle dove, and was once known as the Carolina pigeon or Carolina turtledove.  It is one of the most abundant and widespread of all North American birds.  It is also a leading gamebird, with more than 20 million birds (up to 70 million in some years) shot annually in the U.S., both for sport and for meat.  Its ability to sustain its population under such pressure is due to its prolific breeding; in warm areas, one pair may raise up to six broods of two young each in a single year.  The wings make an unusual whistling sound upon take-off and landing, a form of sonation.  The bird is a strong flier, capable of speeds up to 88 kph . The ring-necked dove ("Streptopelia capicola"), also known as the Cape turtle dove or half-collared dove, is a widespread and often abundant dove species in East and southern Africa.  It is a mostly sedentary bird, found in a catholic variety of open habitats.  Within range, its penetrating and rhythmic, three-syllabled crooning is a familiar sound at any time of the year.  Its name is derived from the semi-collar of black feathers on the lower nape, a feature shared with a number of "Streptopelia" species.  Like all doves they depend on surface water.  They congregate in large flocks at waterholes in dry regions to drink and bathe.
Answer: 1961