jonathangiraldo

Excellent video. There is book on the evolution of cananines that I always recommend: Dogs: Their Fossil Relatives and Evolutionary History by Xiaoming Wang. Perhaps you should enlighten us with a video on the evolution of some other mammal... I'll be looking forward to it...

Yoozer_Naym, The evolutionary individual physical characteristics of mammals you perceive to be unique, are really subtle and superficial. All mammal have the same number of organs whose function is extremely identical, the same number of extremities that evolved slightly differently accoring to the species' needs (as in the elongated neck of giraffes which is no different than that of a human, except for the self replication and prolongated extention of the already present vertebrates, as in the segmented body of the trilobite). Other striking features such as size can be nullified based on the fact that evolution claims that change in size can easily be achievable depending on the adaptability of organism in need, as in the case of the endricothere. Genetically a mouse shares 90% of its genes with humans. While mammals have pretty much the same organs and fuctions for extremities, respiratory systems, etc the same cannot be said of insects, some have as many as 100 legs while others don't even have legs. The distribution of energy and nutrients varies so much from one species of insect to another that we could easily divide all these into unique groups. Differences from lizard to lizard both genetically and anatomically are much larger than that of one mammal with another one (don't forget that birds have recently been included with this family). I dare say that the almost identical functioning of the mammal's physionomy makes it one if not the least diversed of all groups (even a whale has more in common with humans than a millipede with a ladybug).