Strychnine

A poison used in the 20th Century to control moles. Contaminated worms were often left in mole runs where they would be digested by the moles who would then suffer a painful death. Strychnine was banned for the use of controlling moles in 2006, although it was primarily used on golf courses and racecourses, with typically less than 10% of cases using this as a control method, in contrast to the use of a kill-trap. (Source: Baker, S. E., Ellwood, S. A., Johnson, P. J., & Macdonald, D. W. (2016). Moles and Mole Control on British Farms, Amenities and Gardens after Strychnine Withdrawal. Animals: an open access journal from MDPI, 6(6), 39. https://doi.org/10.3390/ani6060039)