<Tr> <Th> Audio format </Th> <Td> Mono </Td> </Tr> <Tr> <Th> Original release </Th> <Td> 8 January 1978 (1978 - 01 - 08)--24 December 1990 (1990 - 12 - 24) </Td> </Tr> <P> All Creatures Great and Small is a British television series based on the books of the British veterinary surgeon Alf Wight, who wrote under the pseudonym James Herriot . In 1977, the BBC tasked producer Bill Sellars with the creation of a television series from Herriot's first two novels, If Only They Could Talk and It Shouldn't Happen to a Vet, using the title of the 1975 film adaptation . The Herriot novels were written in an episodic style, with each chapter generally containing a short story within the ongoing narrative of Herriot's life . This format greatly facilitated their adaptation for a television series . </P> <P> The series had two runs: the original (1978 to 1980, based directly on Herriot's books) was for three series; the second (1988 to 1990, filmed with original scripts) for four . A total of ninety episodes were broadcast . </P>

Where is all creatures great and small based