DENVER (KDVR) A second gray wolf introduced to Colorado has died during April, this time inside the boundaries of Rocky Mountain National Park.

Colorado Parks and Wildlife said that the female gray wolf’s GPS tracking collar issued a mortality alert on April 20. The wolf was one of the 15 released by CPW earlier this year, brought to the state from British Columbia, Canada.

CPW and the National Park Service confirmed the wolf died inside the boundaries of RMNP, and said that the U.S. Fish and Wildlife Service will conduct a necropsy and other investigative efforts because gray wolves are federally listed under the Endangered Species Act.

In March, another one of the gray wolves brought to Colorado from Canada was shot and killed by Wildlife Services in Wyoming during a livestock death mitigation effort in central Wyoming. On April 11, CPW said a second collared gray wolf had been found dead in Wyoming.

CPW said Thursday that wolf survival in the state is still “within normal margins for a wolf population in the Rocky Mountains.”

The agency added that it expected wolf deaths in its gray wolf reintroduction plan and noted that the average length of a gray wolf’s life in the Rocky Mountains ranges between three to four years.