In chapter thirteen, how did Roy broach the subject of the owls?

By the time we reach Chapter 13 of Hoot, Roy's in a whole bunch of trouble. As well as giving Mullet Fingers his identity so that he could get treatment in hospital without his parents finding out, he's been stealing hamburger meat from home to feed the owls at the building site. When Roy gets back from the hospital after visiting Mullet Fingers, he realizes that he has to come clean to his parents.
Summoned into his dad's "den" for a talk, Roy carries with him a copy of The Sibley Guide to Birds. This gives him the chance to broach the tricky subject of the owls at the building site. He shows his dad a picture of a burrowing owl, the very same species that's under threat from the building of Mother Paula's All-American Pancake House. From then on, Roy spills the beans, telling his old man everything he's been up to. After their lengthy conversation, Roy's dad says that he'll think things over a little more. This indicates once more what a thoughtful individual he is and how he's not just Roy's father, but one of his very best friends.