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Yeah I always sit under the speed limit when crusing through country roads, my brother lives our in the country and has hit many kangaroos.
I had one jump out infront of my car once, and they just come from nowhere. You can't see them coming till they're infront of you. The worst part is usually they get a fright and then stop dead in their tracks, so you gotta jam on the brakes or swerve around them.
I Imagine this would have been the same for that deer.
Ride safe bro :)