I disagree with everything above.   It depends on Cow or Bull, & age.     I now have a Cow Moose in my  freezer.   Definitely a mature cow.    Bigger than usual.    It's tough to eat, and doesn't follow the reputation that Moose meat has.    
I have had Mature Cow Elk that were incredible.      Sometimes it's the luck of the draw.
With Caribou, I know you cannot eat a Rut Caribou.