In claiming that mammals are descended from reptiles, Darwinists point to fossils of certain reptiles that are now extinct. The fact that these creatures are extinct lets Darwinists engage in whatever speculations they like. However, scientific research and investigation has revealed the invalidity of their claims. For example, as a result of the investigation of the brains of such reptiles, it was concluded that these life forms did not possess mammalian characteristics, but bore a complete resemblance to reptiles. The fossil record has also revealed that the different mammal species emerged with all the characteristics they possess and never changed thereafter. The nearly 90-million-year-old tiger fossil pictured, identical to present-day specimens, is one of the proofs that evolution never happened.