New Moon‘s cast is steadily filling out…and in a nice way.

USA Today has just revealed the four men - Chaske Spencer, Alex Meraz, Kiowa Gordon and Bronson Pelletier - who will comprise the wolf pack Jacob Black belongs to. (Now we know why Taylor Lautner’s role was considered so critical.)

By the way - if you’re thinking that this shirtless picture is nothing more than a publicity stunt, you’d be wrong. The actors, all of Native American descent, will spend their on-screen time this way.

“They went through wolf camp together, and they are in constant training. It paid off as a bonding thing for them and helped them to get to know one another. They drove each other to get more buff,” director Chris Weitz stated.

The Twilight Saga: New Moon unfolds in theaters on November 20.