Robinson sat up and peered out at the lawn. I had no idea you were so deprived. They're the best bugs in the world because they can light up their butts. It's how they find mates
Robinson is surprised and curious as he sits up and looks outside at the lawn, indicating his interest in the environment around him. He seems unaware of certain details and is now trying to understand or notice something new.
The narrator mentions that fireflies are exceptional because they can glow from their abdomens, which helps them attract mates. This detail highlights the unique and fascinating behavior of these insects, adding to the appreciation of their natural abilities.