Species (Grow Your Own)

On the planet Hespic, the Eleventh Doctor, Amy Pond and Rory Williams encountered a species resembling a cross between a chicken and a sheep. It exuded some kind of super-fertiliser from its constant flatulence, probably due to its diet. One of the creatures was captured by the TARDIS team, who moved it to another planet where it could freely roam, helping stimulate agriculture. (COMIC: Grow Your Own)