ALBUQUERQUE, N.M.—Another Mexican gray wolf has been found dead in the Southwest, but federal officials have refused to provide any details.

The wolf reintroduction team confirmed in its latest monthly report that the male wolf died in March. However, the U.S. Fish and Wildlife Service, which oversees the troubled wolf program, would not say where the animal was found or how it might have died.

This marks what is believed to be the second death this year of an endangered Mexican gray wolf.

In January, an employee with the U.S. Department of Agriculture's Wildlife Services shot what officials described as a "canine." The employee reported the shooting because the animal looked like a Mexican wolf after closer inspection.

Tests are being done, but federal officials have been tightlipped about the case.