Answers Activity 133


In the late 1930s, a group of
American scientists seeking dinosaur fossils made some noteworthy finds. Although one of their expeditions discovered no fossils, it nonetheless to be important in terms of the information about dinosaurs it provided.

During that historic expedition, which took place along the of the Paluxy river in Texas, something extraordinary was revealed: a dinosaur track, clearly in the rock. These dinosaur footprints their preservation to the salts and mud that covered them and then hardened into rock, before to light 100 million years later. Tracks like these are to experts.

There have been great gaps in scientists' understanding of dinosaur
, and so such footprints are useful since they provide direct of how dinosaurs actually moved. Scientists have used these and other footprints to determine how quickly different species walked, concluding that many kinds of dinosaur must have travelled in .

the tracks of four-legged dinosaurs seem to that, in spite of being reptiles, these creatures must have moved in a very similar way to living mammals, such as elephants – a pattern of movement from that of most contemporary reptiles, such as crocodiles.

This leads to an interesting question: Might existing mammals have more to teach us about the extinct reptiles that once walked the earth?


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