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Updated: May 21, 2025
In fact, bacteriologists soon came to the consoling conclusion that the avian bacillus might be practically disregarded as a source of danger to human beings, so widely different were the conditions in their moist and moderately warm tissues to those of the dry and superheated tissues of the bird to which it had adjusted itself for so many generations.
This bird is intelligent and by no means a slave to habit; because he has behaved in a certain way once, there is no law, avian or divine, that compels him to repeat that conduct on the next occasion. Nor is it safe to generalize about him, or any other bird for that matter.
The longer he observes any one species or individual, the more does he find in it to reward his attention; this is not the case, however, with humming-birds, which possess the avian body but do not rank mentally with birds.
When the wild birds came about him he entertained them by whistling his favorite air, which sent the birds off in a panic." Do not the facts recited in this sketch prove that birds know and acquire some things through the promptings of instinct, while other things they can learn only by avian teaching? My notes on instinct and education in bird song correspond with the conviction expressed by Dr.
It is difficult, then, to believe that the Avian limb was developed in any other way than by a comparatively sudden modification of a marked and important kind. How, once more, can we conceive the peculiar actions of the tendrils of some climbing plants to have been produced by minute modifications? These, according to Mr. Darwin, oscillate till they touch an object, and then embrace it.
On the other hand, the shrike's larynx, including the glottis, is a clumsy affair, whereas the mocker's larynx is indeed wonderfully made. It must not be supposed, however, that the syrinx does not perform an important function in the production of avian melody. It acts as a regulator or meter of the air impelled from the lungs.
We have had to stretch the definition of the class of birds so as to include birds with teeth and birds with paw-like fore-limbs and long tails. There is no evidence that Compsognathus possessed feathers; but, if it did, it would be hard indeed to say whether it should be called a reptilian bird or an avian reptile.
The nuthatch of central Europe, scientifically known as Sitta caesia, is closely related to our American forms, resembling them in many of his habits. In studying the literature of the transatlantic species, we at once stumble upon the reason for calling this avian family by the somewhat peculiar and apparently inapt name of nuthatch.
The theory of evolution can do little toward accounting for the anomaly, and even if it should venture upon some suggestions it would still be just as difficult to explain the cause of the evolution in this special group, while all other avian groups follow the law of thrift and self-reliance.
For instance, while the guinea-pig and the rabbit could be readily inoculated with human bacilli, they could only be infected with difficulty by cultures of the bovine bacillus; while the only animal that could be inoculated at all with the avian or bird bacillus was the rabbit, and he only occasionally.
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