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
Last Chance for Animals and media attention. LCA opposes the use of animals in food and clothing production, scientific experimentation, and entertainment. LCA also promotes a cruelty-free lifestyle and the ascription of rights to non-human beings. They support veganism and oppose animal testing. As their budget and staff increased from 2000 and on, LCA has expanded its focus beyond vivisection. LCA also now focuses on pet theft, the fur trade, and circuses, and it has also focused on animal use in other forms of entertainment, as well as on large-scale "factory" farming issues. The organization also provides money and support for the animal rescue