On the Manner of Locomotion of the Dinosaurs Especially Diplodocus With Remark
On the Manner of Locomotion of the Dinosaurs Especially Diplodocus With Remark
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When these animals are walking, the humerus and the femur move backward and forward mostly in horizontal planes. In most mammals, on the contrary, the humerus is turned backward against the thorax and the femur forward against the flank. The hand, which otherwise would be directed backward, is turned forward by the crossing of the bones of the lower arm. The movements of arm and leg are then mostly in sagittal planes. In the duckbill and the echidnas the limbs have retained the position found i...n most reptiles.
Now, among all the reptiles that live today there are none, except perhaps the chameleons, that have attained even an approach to the condition found among the mammals.
It is evident that before the close of the Jurassic there existed both carnivorous and herbivorous dinosaurs that went about habitually on only their hinder legs; but it is by no means necessary to believe that the immediate ancestors of these bipeds walked first like mammals and afterwards like birds. It is well known that certain lizards can run swiftly on their hind legs, the fore legs and the tail being held free from the ground.
What to read after On the Manner of Locomotion of the Dinosaurs Especially Diplodocus With Remark?
You can find similar books in the "Read Also" column, or choose other free books by Oliver Perry Hay to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
When these animals are walking, the humerus and the femur move backward and forward mostly in horizontal planes. In most mammals, on the contrary, the humerus is turned backward against the thorax and the femur forward against the flank. The hand, which otherwise would be directed backward, is turned forward by the crossing of the bones of the lower arm. The movements of arm and leg are then mostly in sagittal planes. In the duckbill and the echidnas the limbs have retained the position found i...n most reptiles.
Now, among all the reptiles that live today there are none, except perhaps the chameleons, that have attained even an approach to the condition found among the mammals.
It is evident that before the close of the Jurassic there existed both carnivorous and herbivorous dinosaurs that went about habitually on only their hinder legs; but it is by no means necessary to believe that the immediate ancestors of these bipeds walked first like mammals and afterwards like birds. It is well known that certain lizards can run swiftly on their hind legs, the fore legs and the tail being held free from the ground.
What to read after On the Manner of Locomotion of the Dinosaurs Especially Diplodocus With Remark?
You can find similar books in the "Read Also" column, or choose other free books by Oliver Perry Hay to read onlineMoreLess
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