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.