The RBST Watchlist is a document showing the rarity of the UK's native breeds of mammal.
Every year, RBST collects data from over 130 breed societies, including the number of males and females registered. This data is used, along with a multiplier, to estimate the number of registered breeding females in the UK for each breed. This is used to place each breed either in one of the 5 categories on the Watchlist, or in the 'Other Native Breeds' category, for those that are not rare but still fulfill our criteria for a native breed.