[@rush99999]Yes indeed. They are warm blooded and big, so lots of body heat. 
Also, I will say that an Ogre isn't bullet proof, but its tough, so unless you hit it straight in the eye or temple, it'll take a few shots to take it down. In my initial prologue post, Kayden and Morek fought an Ogre on the first part of the story. It showcased how hard they died.