Stumped by a DownEast.com trivia question – again

OK, so I was stumped by today’s DownEast.com trivia question.
And I’m a tiny bit embarrassed by that since I grew up in the Maine North Woods and I should have known better. Here it is:

What's a Bangor Tiger?

Answer

It's a traditional name for a skillful competitor in the sport of log-rolling (birling). The name was given to Penobscot river-drivers in the nineteenth century.

I’ll remember it now, you can be sure of that.