A newly born Mexican gray wolf cub, an endangered native species, interacts with his mother at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. Though once held in high regard in Pre-Columbian Mexico, it is the most endangered gray wolf in North America, having been extirpated in the wild during the mid-1900s through a combination of hunting, trapping, poisoning and digging pups from dens. (Photo by Daniel Becerril/Reuters)





A newly born Mexican gray wolf cub, an endangered native species, interacts with his mother at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)





Newly born Mexican gray wolf cubs, an endangered native species, are seen at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)





A newly born Mexican gray wolf cub, an endangered native species, is seen at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)





A newly born Mexican gray wolf cub, an endangered native species, is seen at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)





A newly born Mexican gray wolf cub, an endangered native species, is seen at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)





A newly born Mexican gray wolf cub, an endangered native species, is seen at its enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)





A wolf pack, an endangered native species, are seen at their enclosure at the Museo del Desierto in Saltillo, Mexico, July 19, 2016. (Photo by Daniel Becerril/Reuters)