The ( Oryzomys palustris), a relative of O. peninsulae from the eastern United States It is uncertain how Oryzomys peninsulae arrived at its recent locale in Baja California Sur. In 1922, Nelson suggested that it may have been from another part of Mexico in a shipment of farm products, but this hypothesis is disproved by the clear differentiation from other western Mexican Oryzomys that the species exhibits. The species's range may be in nature: while Oryzomys is currently found along the eastern coast of the only as far north as coastal southern, the past distribution of the genus may have extended further northward, perhaps even into the southwestern, and from there south into Baja California. Subsequent disappearance of Oryzomys from the northern regions would have led to its observed, with O. peninsulae isolated on the peninsula. This possibility is supported by the relatively close resemblance between O. peninsulae and O. couesi mexicanus, from coastal western Mexico. Alternatively, the ancestor of Oryzomys peninsulae may have arrived by during the late, about six million years ago, when the southern tip of the Baja California peninsula was an island located near what is now and in western Mexico.
Pyrrhura is a genus of parrots in the Arini tribe. They occur in tropical and subtropical South America and southern Central America ( Panama and Costa Rica ). Most are restricted to humid forest and adjacent habitats, but one species, the blaze-winged parakeet, prefers deciduous or gallery woodland, and another.
Some plants and birds from the area may have a similar heritage. Footnotes [ ].
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