The births are part of a three-year program to reintroduce the subspecies to a habitat from which they disappeared three decades ago.

The country’s National Commission of Natural Protected Areas says the wolf pups were spotted last month by a team of researchers in the Western Sierra Madre Mountains in northern Mexico.

The above footage shows the wolf cubs playing.

Mexico began reintroducing the wolves three years ago. The parents of this litter were released in December with hopes they would breed.

Authorities seldom reveal the exact location of breeding pairs in recovery programs in order to protect endangered species.

The Mexican gray wolf was almost wiped out in the southwestern United States by the same factors that eliminated the animal in Mexico, such as hunting, trapping and poisoning.

The Mexican gray wolf is still an endangered species in the United States and Mexico.