Question: Billy The Rabbit was release by an author from what country?

Context paragraphs:
Peter Cottontail: Peter Cottontail is a name temporarily assumed by a fictional rabbit named Peter Rabbit in the works of Thornton Burgess, an author from Springfield, Massachusetts.  In 1910, when Burgess began his "Old Mother West Wind" series, the cast of animals included Peter Rabbit.  Four years later, in "The Adventures of Peter Cottontail", Peter Rabbit, unhappy at his plain-sounding name, briefly changed his name to Peter Cottontail because he felt it made him sound more important.  He began putting on airs to live up to his important-sounding name, but after much teasing from his friends, soon returned to his original name, because, as he put it, "There's nothing like the old name after all."  In the 26-chapter book, he takes on the new name partway through chapter 2, and returns to his "real" name, Peter Rabbit, at the end of chapter 3.  Burgess continued to write about Peter Rabbit until his retirement in 1960, in over 15,000 daily syndicated newspaper stories, many of them featuring Peter Rabbit, and some of them later published as books, but "Peter Cottontail" is never mentioned again.

Jack Rabbit (Seabreeze): Jack Rabbit is an "out and back" wooden roller coaster located at Seabreeze Amusement Park in Irondequoit, New York.  At its opening in 1920, it was the fastest roller coaster in the world.  The Giant Dipper in Santa Cruz, California, superseded it in 1924.  Jack Rabbit is the fourth oldest operating roller coaster in the world and the second oldest in the USA.  The oldest, Leap-The-Dips in Altoona, Pennsylvania, was closed from 1985 to 1999, making Jack Rabbit the oldest "continuously operating" coaster in the country.

Billy the Rabbit: Billy The Rabbit is an album released by Gyan and Michael Leunig in 2006.  The project involves Gyan adapting several of Leunig's poems to music; with some additional lyrics contributed by Gyan.  The album was released on the Muse Agency label containing a booklet of poems and illustrations by Leunig.

Michael Leunig: Michael Leunig (born 2 June 1945), typically referred to as Leunig (his signature on his cartoons), is an Australian cartoonist, poet and cultural commentator.  His best known works include "The Adventures of Vasco Pyjama" and the "Curly Flats" series.  He was declared an Australian Living Treasure by the National Trust of Australia in 1999.

Roger Rabbit: Roger Rabbit is a fictional animated rabbit character.  The character first appeared in author Gary K. Wolf's 1981 novel, "Who Censored Roger Rabbit? ".  In the book, Roger is a second-banana in popular comic strip, "Baby Herman".  Roger hires private detective Eddie Valiant to investigate why his employers, the DeGreasy Brothers, have reneged on their promise to give Roger his own strip.  When Roger is found murdered in his home, Valiant sets out to look for the killer, with the help of Roger's "dopple" (in the book, comic characters can construct physical copies of themselves using their minds that last for only a few days).

Reader Rabbit Preschool: Sparkle Star Rescue: Reader Rabbit Preschool: Sparkle Star Rescue is a game in the "Reader Rabbit" series by The Learning Company.  It is the first game in the series which includes a young Reader Rabbit and Sam the Lion.  The title release was announced on June 28, 2001.  The game is recommended for ages 3–6.  The game teaches "shape and size recognition, letter recognition and listening", among other skills, including maths-related ones.

Lapine language: Lapine is a fictional language created by author Richard Adams for his 1972 novel "Watership Down", where it is spoken by rabbit characters.  The language was again used in Adams' 1996 sequel, "Tales from Watership Down", and has appeared in both the film and television adaptations.  The fragments of language presented by Adams consist of a few dozen distinct words, and are chiefly used for the naming of rabbits, their mythological characters, and objects in their world.  The name "Lapine" comes from the French word for rabbit, "lapin", and can also be used to describe rabbit society.

A Frightened Rabbit EP: A Frightened Rabbit EP is an EP by Scottish indie rock band Frightened Rabbit, released on 31 October 2011 on Atlantic Records as a free download and on ten-inch, limited edition vinyl.  Self-produced by the band, "A Frightened Rabbit EP" was the band's first release on Atlantic, and the first to feature contributions from guitarist Gordon Skene.

Rhinelander rabbit: The Rhinelander rabbit is a medium-sized breed of European rabbit from Germany.  They are known for their distinctive facial "butterfly markings", generally of black and orange, on a white background.  Initially developed in Germany in the first decade of the 20th century, they began to be exported to other countries in the 1920s.  Although popular in Germany at first, interest in the breed dwindled by 1930 possibly due to an increase in popularity of the Checkered Giant; however, they experienced a resurgence in popularity after World War II.  Interest also waxed and waned in the United States, where the breed experienced a 40-year absence between 1932 and 1972.  Re-establishment in that country in the 1970s resulted in the creation of the Rhinelander Rabbit Club of America in 1974.  Today, the worldwide population is estimated at less than 2,000 by the American Livestock Breeds Conservancy, and in Great Britain they are grouped with other rare rabbit breeds in the Rare Varieties Club.

Rabbit on My Wheel: Rabbit on My Wheel is the third studio album by Canadian country-rock artist Ridley Bent.  It was released on June 15, 2010 by Open Road Recordings.  Although Bent's debut album, "Blam!" , blended hip hop and country, singles from "Rabbit on My Wheel" received regular airplay on mainstream country radio stations.

Supporting paragraphs: Billy the Rabbit Michael Leunig
Answer: an Australian