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In our plant-eating ancestors this rudimentary organ was much larger and had a useful function. Finally, we have important appendages of the alimentary tube in the bladder and urethra, which belong to the alimentary system. These urinary organs, acting as reservoir and duct for the urine excreted by the kidneys, originate from the innermost part of the allantoic pedicle.
But it grows considerably in the mammals, coils into various folds, and divides into two sections, the first and longer of which is the colon, and the second the rectum. In the plant-eating mammals this is very large, but it is very small or completely atrophied in the flesh-eaters.
Tracks around the steaming swamps were as close as they had come. Once, late in the evening of the second day they caught a fleeting glimpse of a plant-eating brontosaurus lumbering through the brush. All three of the boys had found it difficult to sleep in the jungle. The first two nights they had taken turns at staying on guard and tending the campfire.
No anatomist had been able to give any feasible conjecture as to the affinities of this minute quadruped until Dr. This would lead us to the conclusion that Microlestes was marsupial and plant-eating.
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