Nimravides the similarities between them at first glance, based on autapomorphies in the skeleton, the two animals are too different to be classified as species of the same genus, and thus, "Nimravides" remains separate as its own genus within the Homotherini. Nimravides Nimravides is a genus of extinct saber-toothed cats that lived in North America during the middle and late Miocene, between 13.6 and 4.9 Ma. Despite its scientific name, "Nimravides" does not belong to the Nimravidae, but is a true cat, belonging to the family Felidae. "Nimravides catacopsis", one of the largest and latest species, was quite large, measuring at
World Day for Laboratory Animals groups opposed to the use of animals in research. In April 2010 protesters marched through central London calling for an end to the use of animals in research. A similar march took place in Birmingham in 2012. and Nottingham in 2014. World Day and World Week For Animals In Laboratories have also attracted attention from scientific groups defending the use of animals in research. On 22 April 2009 members of UCLA Pro-Test held a rally in support of biomedical research on animals, and to condemn the violence and harassment directed at faculty member Prof. David Jentsch by animal activists. NAVS