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| | Passerine - Wikipedia, the free encyclopedia |
 | | Many passerines are songbirds and have complex muscles to control their syrinx; all of them gape in the nest as infants to beg for food. |
 | | Many passerine families were grouped together on the basis of morphological similarities which, it is now believed, are the result of convergent evolution, not a close genetic relationship. |
 | | A major branch of the passerine tree, the Passerida (or sparrow-like forms), emerged either as the sister group to another (the Corvida, or crow-like birds), or more likely as a subgroup of the Corvida, and reached the northern hemisphere, where there was a further explosive radiation of new species. |
| en.wikipedia.org /wiki/Passerine |
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