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That the animals of the present are the altered animals of the past, that the plants of to-day are the modified plants of yesterday, that civilized man of to-day is the savage of yesterday and the tree-dweller of the day before, is no longer debatable to the great mass of biologists.
The animals living on the plain needed acute senses to detect the approach of their prey or their enemies; the tree-dweller found less demand on his sense of hearing, the "speaking-trumpet" was discarded, and the development of the internal ear proceeded on the higher line of the perception of musical sounds.
For $20 anyone can restock any bit of woods with the most companionable and most beautiful tree-dweller that nature has given us. The question now is, which will you choose a gray squirrel colony to every farm, or lifeless desolation? We ask every American to lend a hand to save Silver-Tail.
A pile of snow showed where a small avalanche had plunged down. That must have been when she disturbed it on the branches in climbing. His glance swept up the trunk and came to a halt. With his rifle he covered the figure crouching close to it on the far side. "Come down," he ordered. He was due for one of the surprises of his life. The tree-dweller slid down and stood before him.
In the historic period he has survived plague and pestilence, and want and famine. What must he have survived in prehistoric times! What must he have had to contend with as a cave-dweller, as a tree-dweller, as a river-drift man! Before he had tools or weapons what must he have had to contend with!
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