and then proceeding to another, like a kestrel, and at other times standing stationary on the margin of water, and then dashing
like like 1859 1860 1861 |
into it like 1866 1869 1872 |
a kingfisher at a fish. In our own country the larger titmouse (Parus major) may be seen climbing branches, almost like a creeper; it
often, often, 1859 1860 1861 1866 | sometimes, 1869 1872 |
like a shrike, kills small birds by blows on the head; and I have many times seen and heard it hammering the seeds of the yew on a branch, and thus breaking them like a nuthatch. In North America the black bear was seen by Hearne swimming for hours with widely open mouth, thus catching,
almost like almost like 1860 1861 1866 1869 1872 | like 1859 |
a whale, insects in the water. ↑1 blocks not present in 1860 1861 1866 1869 1872; present in 1859 | Even in so extreme a case as this, if the supply of insects were constant, and if better adapted competitors did not already exist in the country, I can see no difficulty in a race of bears being rendered, by natural selection, more and more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as a whale.
|
|
As we sometimes see individuals
of a species of a species 1859 1860 1861 1866 1869 |
OMIT 1872 |
following habits
widely widely 1859 1860 1861 1866 1869 | widely 1872 |
different from those
of their own of their own 1860 1861 1866 1869 |
both of their own 1859 |
proper to their 1872 |
species and
of of 1859 1860 1861 1866 1869 | to 1872 |
the other species of the same genus, we might
expect, expect, 1859 1860 1861 1866 | expect 1869 1872 |
on my theory, on my theory, 1859 1860 1861 1866 |
OMIT 1869 1872 |
that such individuals would occasionally
have have 1859 1860 1861 1866 | have 1869 1872 |
given given 1859 1860 1861 1866 | give 1869 1872 |
rise to new species, having anomalous habits, and with their structure either slightly or considerably modified from that of their
proper proper 1859 1860 1861 1866 1869 | proper 1872 |
type. And such instances
do do 1859 1860 1861 1866 1869 | do 1872 |
occur in nature. Can a more striking instance of adaptation be given than that of a woodpecker for climbing trees and
for for 1859 1860 1861 1866 | for 1869 1872 |
seizing insects in the chinks of the bark? Yet in North America there are woodpeckers which feed largely on fruit, and others with elongated wings which chase insects on the
wing. wing. 1861 1866 1869 1872 | wing; 1859 1860 |
On On 1861 1866 1869 1872 | and on 1859 1860 |
the plains of La Plata, where
not not 1859 1860 1861 1866 1869 | hardly 1872 |
a tree grows, there is a
woodpecker woodpecker 1861 1866 1869 1872 | woodpecker, 1859 1860 |
(
Colaptes campestris
) which has two toes before and two behind, a long pointed tongue, stiff pointed tail feathers, but not so stiff as
(
Colaptes campestris
) which has two toes before and two behind, a long pointed tongue, stiff pointed tail feathers, but not so stiff as
1861 |
which in every essential part of its organisation, even in its colouring, 1859 1860 |
(
Colaptes campestris
) which has two toes before and two behind, a long pointed tongue, stiff pointed tail-feathers, but not so stiff as
1866 |
(
Colaptes campestris
) which has two toes before and two behind, a long pointed tongue, pointed tail-feathers, sufficiently stiff to support the bird in a vertical position on a post, but not so stiff as
1869 |
(Colaptes campestris) which has two toes before and two behind, a long pointed tongue, pointed tail-feathers, sufficiently stiff to support the bird in a vertical position on a post, but not so stiff as 1872 |
in the
typical woodpeckers (yet I have seen it use its tail when alighting vertically on a post), and a straight strong beak. typical woodpeckers (yet I have seen it use its tail when alighting vertically on a post), and a straight strong beak. 1861 1866 |
harsh tone of its voice, and undulatory flight, told me plainly of its close blood-relationship to our common species; yet it is a woodpecker which never climbs a tree! 1859 1860 |
typical woodpeckers, and a straight strong beak. 1869 1872 |
The beak, however, is not so straight or
strong strong 1861 | so strong 1866 1869 1872 |
as in the typical
woodpeckers; woodpeckers; 1861 | woodpeckers, 1866 1869 1872 |
but it is strong enough to bore into
wood; wood; 1861 1866 | wood. 1869 1872 |
and and 1861 1866 | and 1869 1872 |
I
may may 1861 1866 | may 1869 1872 |
mention, mention, 1861 1866 | mention, 1869 1872 |
as
another another 1861 1866 | another 1869 1872 |
illustration illustration 1861 1866 | illustration 1869 1872 |
of
the the 1861 1866 | the 1869 1872 |
varied varied 1861 1866 | varied 1869 1872 |
habits habits 1861 1866 | habits 1869 1872 |
of
the the 1861 1866 | the 1869 1872 |
tribe, tribe, 1861 1866 | tribe, 1869 1872 |
that that 1861 1866 | that 1869 1872 |
a
Mexican Mexican 1861 1866 | Mexican 1869 1872 |
Colaptes Colaptes 1861 1866 | Colaptes 1869 1872 |
|