An endangered wolf went in search of a mate. The border wall blocked him.

The travails of a Mexican gray wolf named Mr. Goodbar show the grave threat posed by the U.S.-Mexico border wall.

In late 2021 an endangered Mexican gray wolf set out on an epic journey.

Known as Mr. Goodbar, the male had months earlier left his pack in eastern Arizona in search of his own territory and a mate. He headed south and east, through the Chihuahuan Desert, a vast, biodiverse expanse of grasslands and shrublands interspersed with mountain ranges and valleys.

The lanky canine, sporting a mix of silvery brown fur and not yet two years old, passed by the outskirts of Las Cruces, New Mexico, on November 22. The land is wide open and speckled with creosote, yucca, and cacti. Before him were distant peaks, including now extinct volcanoes and craters of the East Potrillo Mountains, the southern tip of which

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