Their easy to tame but hard to get they spawn in the red woods very useful because they are the only Dino that you can harvest mutton from get a Dino that can pick up them (agry) and hope you have a cage because the are fast XD
One thing to say is: never have three! Always only have two, because having three of these is a waste of tame slots. Don't take it personnally, megaloceros, i have this rule with all my tames. Even my argys. But, if you are doing a breeding program with these, have 10 max, is my suggestion. having 3 of these is bad, because...are they that useful to have 3? And, If there is two females... you are going to end up with two females, one male, and a bunch of unclaimed baby megaloceros. and its pretty hard to let those unclaimed babys die... so now you have 20 megaloceros. (this will happen if they are in a breeding pen on wander.) The lesson is: don't have 2 female and 1 male moose on wander in a breeding pen. Shortened lesson: don't have three megaloceros in the first place.
Easy tame, just use bolas, trap/protect it with spike walls, feed berries, and use narcotics/narco berries to keep torpor up. I play on a small tribes server and tamed a max level in less than an hour with 3x.