I've collided with them twice:

1. Dumb thing was safely off to my right, but on seeing me it bolted toward the pond on my left. I ran right over it with both wheels, caught an amazing amount of air, then landed w/o crashing. It felt like I'd run over a football; Amazingly firm. Last seen, the goose was sitting in the pond squawking unhappily.

2. Dumb goose safely off to the side of the path with goslings. Stupid thing tried to attack me. Just as it spread its wings and went airborne, coming head on...my right brake lever (mtn bike) caught it in the breast, knocking it backward out of the air.