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And in all these countries the trees grow
intermingled, so that in every extensive forest we have a considerable
variety, as may be seen in the few remnants of our primitive woods in
some parts of Epping Forest and the New Forest.
Among animals the same law prevails, though, owing to their constant
movements and power of concealment, it is not so readily observed. As
illustrations we may refer to the wolf, ranging over Europe and Northern
Asia, while the jackal inhabits Southern Asia and Northern Africa; the
tree-porcupines, of which there are two closely allied species, one
inhabiting the eastern, the other the western half of North America; the
common hare (Lepus timidus) in Central and Southern Europe, while all
Northern Europe is inhabited by the variable hare (Lepus variabilis);
the common jay (Garrulus glandarius) inhabiting all Europe, while
another species (Garrulus Brandti) is found all across Asia from the
Urals to Japan; and many species of birds in the Eastern United States
are replaced by closely allied species in the west.


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