London, UK. Thursday 3rd January 2013. Zookeepers count every animal during ZSL London Zoo’s annual stocktake. The compulsory count is required as part of ZSL London Zoo’s zoo license, and all of the information is logged into the International Species Information System (ISIS), where it’s used to manage the international breeding programmes for endangered animals. Spectacled Owl, Barn Owl and an Eagle Owl.