Why mating bears indulge in this blood-curdling duet is a mystery which only the bears themselves can explain.

It lasts for about a minute, and during this particular minute Muskwa, who lay outside the thicket, thought that surely the glorious hour had come when Thor was beating up the parent of Pipoonaskoos.

And instantly he looked for Pipoonaskoos.
Unfortunately the Willie-bear came sneaking round the edge of the brush just then, and Muskwa gave him no chance to ask questions.

He shot at him in a black streak and Pipoonaskoos bowled over like a fat baby.

For several minutes they bit and dug and clawed, most of the biting and digging and clawing being done by Muskwa, while Pipoonaskoos devoted his time and energy to yelping.
Finally the larger cub got away and again took to flight.