Wolf packs have just one male.

(“What I don’t get is why I have to be the girl wolf,” Marco grumbled.

"We had one male and one female," Cassie explained for the tenth time. "If two of us morph into the male, we’d have two males. Two males wolves might decide they had to fight for dominance."

"I could control it," Marco said.

"Marco, you and Jake already fight for dominance, and you’re just ordinary guys," Rachel pointed out.

"She’s right," Cassie said sadly. "I’m afraid your primitive male behavior might slow us down." —#3, The Encounter)

The books’ representation of wolves is in fact inaccurate, though, because there are no dominance fights within wolf packs. A wolf “pack” is nothing more or less than a family: Mom, Dad, their year-old children born last summer, and their pups born this summer. There could be more than one male in a wolf pack, but that would be Dad and his sons, and the sons would not challenge the father for dominance.

Good to know! And unlike Tobias and his limited grasp of appetizers, Cassie really should know better.