Alfred Edmund Brehm,
From North Pole to Equator: Studies of Wild Life and Scenes in Many Lands
(1896)
“ Thus, too, the squirrels of Siberia, which, in ordinary years, undertake, at the most, only short excursions, assemble in vast armies, hurry in troops or companies from tree to tree, in compact masses from forest to forest, swim across rivers and streams, throng into towns and villages, lose their lives by thousands; but suffer no obstacle or hindrance—not even the most obvious dangers—to delay them or divert them from their path. The soles of their feet become worn and cracked, their nails ground down, the hairs of their usually smooth fur rough and matted. ”
