Felidae Oligocene, about 25 million years ago, with the appearance of "Proailurus" and "Pseudaelurus". The latter species complex was ancestral to two main lines of felids, the cats in the extant subfamilies and a third major group of extinct cats, which are assigned to the subfamily Machairodontinae. The machairodonts included the saber-toothed cats such as the "Smilodon". The "false sabre toothed cats", the Barbourofelidae and Nimravidae, are not true cats, but are closely related and together with Felidae and other cat-like carnivores (hyaenas, viverrids and mongooses) make up the feliform carnivores. Results of mitochondrial analysis indicates that all the Felidae descended
Centre for Animals and Social Justice Leicester respectively. One of the issues the CASJ explores is how nonhumans can be offered political representation as vulnerable individuals. The CASJ was involved in 2012 with other animal protection groups in consulting with members of parliament over an amendment to the Animals (Scientific Procedures) Act 1986. In 2014 the CASJ garnered the support of 16 animal protection organizations in support of a governmental Animal Protection Commission. Centre for Animals and Social Justice The Centre for Animals and Social Justice (CASJ) is a British charity founded in 2011 to advance the social and political status of nonhuman animals. The CASJ