Storm over Warlock1960

Earth is colonizing worlds, but there are intelligent bugs who want to glean everything off of those worlds and have no hesitation in killing men to do it. A young man and his pet wolverines are the only two survivors of such a raid and must keep scrambling to keep from joining their dead - up until the time when he decides to carry the fight to the bugs. Like most all of Andre Norton's books, a very good read.