Gumberoo

The Gumberoo is a mythical creature in American lumberjack culture. It was said to be larger than a bear and resemble a walking football, with a tough hide that nothing could pierce. The only way to kill it was said to be fire, which caused the creatures to explode.

Description

The Gumberoo is said to look like a fat bear in shape but completely hairless except for its prominent eyebrows and bristly hairs on its chin. Instead it has dark, smooth, and extremely tough leather-like skin. This makes the beast invulnerable to arrows, axes and bullets. Anything shot at the beast, simply bounced off.
Gumberoo was also said to always be hungry and devoured anything it can find that looked like food. A whole horse may be eaten at one sitting, but its not enough.

They make their dens in the bases of huge, burned-out cedar trees. The creature spends most of its time in a state of hibernation, only leaving its lair a few times a year to search for food. When active, the gumberoo is always hungry and will eat any living creature that crosses its path.

Sightings

The first confirmed kill of a gumberoo by an M-Force agent occurred in 1957, when Mike Mulligan and Abernathy Quinn destroyed a gumberoo near Coos Bay, Oregon. There have been numerous reports of gumberoos since then, but only five confirmed sightings and no successful kills.

I found one Youtube clip explain about Gumberoo :

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