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Unlike some neighbors, Spain and Portugal do not have any major natural barriers, like high mountains or an expansive desert, separating the two countries. Hence researchers tracking two species of vulture native to the Iberian peninsula, the griffon vulture and the black vulture, were surprised to find the vultures spend a lot of time on the Spain side of the border but very little time on the Portugal side of the border. The reason why turns out to be a matter of political geography not biogeography: nearly 20 years ago, in an effort to stop the spread of mad cow disease, the European Union issued a directive calling for immediate burial or incineration of cows that died in the field. Portugal has continued to abide by the directive; Spain abandoned it a few months after it was issued. The vultures have figured out all the tasty cow carcasses are on the Spain side of the border. bigthink.com/strange-maps/why-do-vultures-care-about-the-spanish-portuguese-border
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