List the following species in order of gestation length, from longest to shortest.
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The order from longest to shortest gestation is: Horse, cow, goat, pig, dog.
Here is a list of gestation length for the major animal types, in order: Llama 1 year (350d), horse 11 mo (330d), cow 9 mo (~280 d) sheep/goats 5 mo (150d), pig 4 mo (114d), dog/ Cat 2 mo (60d), ferret 1.5 mo (42d.).
Basic questions on estrous cycle and gestation come up over and over, so commit them to memory for the major species at least (cow, horse, dog, cat, sheep/goat, pig).