This was a tough one for me. In fact, I had to do so much checking, that I almost feel like I shouldn't count this as my Saturday completion. True, I didn't look anything up. But I got a lot of wrong guesses, and I might not have known that they were wrong had I not checked. Case in point, 15 Across was "GREATBEAR" but it could have just as easily been "URSAMAJOR" which was what I had to begin with. And DRANG, DRONE and PACKRAT all fit nicely with the wrong clue. So, I completed it, for purposes of this challenge, but, really, I think I need to keep doing the Saturday puzzles.