This ecoregion, as its name suggests, forms a transition between the Sonoran Desert and the Sinaloan Dry Forests. In the northern portions of the ecoregion, many desert elements are present and tress are sparse. Here one might see Gila monsters and Pachycereus cactus scattered among mesquite bushes. Moving south the area becomes more charactreistic of a dry forest, and it is not uncommon to see military macaws roosting near the fragrant pink blossoms of the amapa prieta tree.
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