After cautious introductions, the bioengineered animals are eating, playing and chasing prey together ...

In California, as wolf numbers grow — a remarkable return after a century — livestock producers are increasingly worried as these predators occasionally take down cattle. Gray wolves are an endangered ...

Earlier this year, one of Colorado’s translocated female gray wolves was making broad movements across the Western Slope. Then, one day, she stopped exploring on a wide scale and settled into an area ...