Final answer:
Roy withholds two pieces of information from his father regarding the owls, Mother Paula's, and Mullet Fingers, likely to protect the owls or the plans to save them.
Step-by-step explanation:
When Roy tells his father about the owls, Mother Paula's, and Mullet Fingers, he withholds two critical pieces of information. The question refers to a story where a character named Roy discusses environmental concerns linked with the owls and their habitat, which is threatened by a corporate entity known as Mother Paula's. The character Mullet Fingers is involved in the narrative as an environmental activist. In the context provided, the specific details Roy omits are not given, however, typically within a narrative, a character might withhold information due to a desire to protect someone, avoid conflict, or manipulate a situation to their advantage. Examples would be the exact location of the owls or the plans Mullet Fingers has to save them.