The death of a gray wolf during routine collaring operations in Routt County last month was caused by acute cardiogenic shock, according to a necropsy and mortality report released Friday.

Colorado Parks and Wildlife announced on Tuesday that a gray wolf died during routine collaring operations in Routt County. Gray wolf 2305, a three-year-old breeding male in the King Mountain Pack, ...

Arizona and New Mexico wildlife agencies recently reported that the population of endangered Mexican gray wolves grew by 33 wolves last year.

Twelve of Colorado's 25 released wolves have died. Here is a breakdown of their causes of death and which wolves are still alive.