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Updated: June 11, 2025
It is indeed the best climber among mammals, while it is the only mammal that can neither walk nor stand. When sleeping, the sloth does not hang head downwards, like the vampire, but supports itself from the branch parallel to the earth.
And as to the foot, the great toe of the Marmoset is still more insignificant in proportion than that of the Orang while in the Lemurs it is very large, and as completely thumb-like and opposable as in the Gorilla but in these animals the second toe is often irregularly modified, and in some species the two principal bones of the tarsus, the 'astragalus' and the 'os calcis', are so immensely elongated as to render the foot, so far, totally unlike that of any other mammal.
The very complex structure of the cochlea, one of the most elaborate and wonderful outcomes of adaptation in the mammal body, develops originally in very simple fashion as a flask-like projection from the sacculus. As Hasse and Retzius have pointed out, we find the successive ontogenetic stages of its growth represented permanently in the series of the higher Vertebrates.
And yet the persecution, the impossibility of contending by brute strength, may have forced the mammal into the line of brain-building and placental development. The early development of mammals appears to have been slow. Palæontology proves that they were long surpassed by reptiles and birds. But the little mammal had the future. The battle was to go against the strong. Once again.
It has no gills, like those of the fish, to take air from the water; it is a mammal, a creature that must breathe the free air just as other mammals. Nature is full of surprises. And here she surprises us with a mammal most marvellously fitted to live a fish-like life. The Whale dives to great depths in search of food, and stays under water for a long time.
So the allantois of the reptile has become the placenta of the mammal. In the first instance it served only as an organ of respiration. Now it has come to supply the embryo with rich blood containing both food and oxygen derived from the mother. After the offspring is born this thickened pad breaks loose, and subsequently is also extruded from the body, forming what is known as the afterbirth.
In the past the poor things had often been pinched by hunger and neglect, and at times their only food was rock oysters, clams and crabs. Great quantities of these shell-fish could be gathered in the bay near at hand, but the mountain Indians, who had heretofore lived on the flesh of mammal, did not take kindly to mollusks, and, indeed, ate the shell-fish only as a last resort.
Their rudimentary form was that of the transient affection of a female bird or mammal for its young. First given a definite direction through the genesis of the primitive human family, the development of altruism has formed an important part of the progress of civilization, but as yet it has scarcely kept pace with the general development of intelligence.
As comparative anatomy is easily able to show that, physically, man is but the last term of a long series of forms, which lead, by slow gradations, from the highest mammal to the almost formless speck of living protoplasm, which lies on the shadowy boundary between animal and vegetable life; so, comparative psychology, though but a young science, and far short of her elder sister's growth, points to the same conclusion.
The corpuscles of most mammals are smaller than those of man, but the size of a corpuscle is affected by various circumstances, such as drying or moisture, so that the medical witness is rarely justified in going farther than stating whether the stain is that of the blood of a mammal or not.
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