If you've EVER seen one on the side of the road, they ARE the quintessential "immovable object". Hitting one in a car is a near death sentence. I'm afraid hitting one on a bike is tragic.
I live in a suburban area of our capital city. The interstate off ramp is 1/4 mile from my house. I was coming home a couple weeks ago down my road about 8:30 pm in my truck and a cow (female moose) ran right across the road in front of me. I have a 1-ton 4wd Ram and I was looking it directly in the eye. Fortunately I wasn't going that fast and could stop.