A cow will charge but seldom engage unless you are truly too close to the calf. If you show no 'intent' or back off, she will 'back off'. Now, if you get between her and the calf, for any reason, best be fleet of foot. I once touched a cow on the nose and she had a calf ten feet behind her. It's a long story. Short story... I didn't know they were there and she didn't know I was there (I am a f***ing ninja in the woods). I was on a bull-dozed mound and they were feeding on the edge of it. It was early partridge season and the mound was thick with water birch and popple. We met at arm's length with me on the mound and an 800# momma standing on the level ground while looking me in the eye on the level. I spoke softly, petted her and withdrew. No problem. I have never had a problem with moose. Just gotta 'know' moose.

BTW... if you are out in the open, don't mess with any moose. But, if there is a tree handy, just remember this. They got four legs, you got two. Two legs and a tree beats four legs. >;-)