We have many A-Z keywords for this term.mammalogie
mammal streaming en français
mammals of france
mammal film complet
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T. S. Kemp has provided a more traditional definition: " synapsids that possess a dentary – squamosal jaw articulation and occlusion between upper and lower molars with a transverse component to the movement" or, equivalently in Kemp's view, the clade originating with the last common ancestor of Sinoconodon and living mammals.  The earliest known synapsid satisfying Kemp's definitions is Tikitherium , dated 225 Ma , so the appearance of mammals in this broader sense can be given this Late Triassic date.  
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Mammals are animals . Yes but so are Insects, Reptiles, Spiders, Sponges and Slugs. We need to do better than that. Mammals have a back-bone.Yes but so do Fishes and Frogs and they are not mammals. Mammals are warm-blooded. Yes but so are birds, and birds are not mammals either. So how do we describe a mammal??
1826, anglicized form of Modern Latin Mammalia (1773), coined 1758 by Linnaeus for the class of mammals, from neuter plural of Late Latin mammalis "of the breast," from Latin mamma "breast," perhaps cognate with mamma .