Our Common Cuckoo And Other Cuckoos And Parasitical Birds; An Attempt to Reach a True Theory of Them By Comparative Study of Habit And Function ..
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237 XXXV.
INDIRECT EVIDENCE FROM THE AMERICAN COW-BIRDS.
We have already referred to one point in which a striking commentary on certain actions of the common cuckoo is found in the molothriis or cow- bird — an American species alHed to the starHngs.
They are called cow-birds because they are often seen on the backs of these animals or among the cattle on the ground picking off insects that are COW-BIRDS ON COWS' BACKS AFTER INSECTS.
there. . . .* We may here indicate some other points which wi...ll be suggestive and illustrative of certain traits to be found probably more or less in all parasitic birds.
I. The cow-bird's eggs not only vary greatly in * H. Nehrling, ii, p, 31.
238 Tlie World-Evidence.
colour, but also in size. They show a pearly white, often a pure white, or greyish white, or pale bluish ground colour, and are often spotted, more or less densely, with chocolate-brown, lavender and cinna- mon-brown spots. * We have as yet, though we have very diligently sought for it, met with no record as regards the weight of these eggs as compared with the eggs of other birds of the same size ; but, from analogy, we should expect it to be comparatively heavy, as is the case with our cuckoo's eggs.
What to read after Our Common Cuckoo And Other Cuckoos And Parasitical Birds; An Attempt to Reach a True Theory of Them By Comparative Study of Habit And Function ..?
You can find similar books in the "Read Also" column, or choose other free books by Alexander H Alexander Hay Japp to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
237 XXXV.
INDIRECT EVIDENCE FROM THE AMERICAN COW-BIRDS.
We have already referred to one point in which a striking commentary on certain actions of the common cuckoo is found in the molothriis or cow- bird — an American species alHed to the starHngs.
They are called cow-birds because they are often seen on the backs of these animals or among the cattle on the ground picking off insects that are COW-BIRDS ON COWS' BACKS AFTER INSECTS.
there. . . .* We may here indicate some other points which wi...ll be suggestive and illustrative of certain traits to be found probably more or less in all parasitic birds.
I. The cow-bird's eggs not only vary greatly in * H. Nehrling, ii, p, 31.
238 Tlie World-Evidence.
colour, but also in size. They show a pearly white, often a pure white, or greyish white, or pale bluish ground colour, and are often spotted, more or less densely, with chocolate-brown, lavender and cinna- mon-brown spots. * We have as yet, though we have very diligently sought for it, met with no record as regards the weight of these eggs as compared with the eggs of other birds of the same size ; but, from analogy, we should expect it to be comparatively heavy, as is the case with our cuckoo's eggs.
What to read after Our Common Cuckoo And Other Cuckoos And Parasitical Birds; An Attempt to Reach a True Theory of Them By Comparative Study of Habit And Function ..?
You can find similar books in the "Read Also" column, or choose other free books by Alexander H Alexander Hay Japp to read onlineMoreLess
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