Biologists say rumors of a wolf in Rocky Mountain National Park may be true.
A paw print found Thursday is large enough to be that of a wolf or wolf-dog hybrid.
The only other dogs that would leave a print that size are a "massive malamute or a great Dane," said Dave Augeri, a Denver Zoo biologist.
The track was about 4 inches across and found off a trail heading into open fields.
Park volunteers said they saw a wolf about six weeks ago.
Although wolves are native to Colorado, the predator was wiped out by ranchers, government agents and others about 80 years ago.
The Colorado Division of Wildlife confirmed that a large black animal caught on video by wildlife officers last February in northern Colorado was a wolf.
In 2004, a dead wolf was found along Interstate 70 west of Denver. Its radio collar showed that it was from Yellowstone National Park.
Augeri and his crew have placed 5 cameras in the park in hopes of gathering more evidence.
Here's a piece in the High Country News about what wolves would bring to the ecosystem.