Penny stops, trying to locate the source of the voice, and though she's momentarily surprised to see someone on a tree branch, she reminds herself that this isn't entirely out of place back home, either. Also that it's rude to stare when someone's talking to you--

"Huh? I smell like Robo? Oh, I'm Penny! It's nice to meet you -- I only just arrived today." Maybe someone recognizing scents is slightly less common back home, but this one definitely does not seem like someone from Penny's world. Was she able to see past her outer appearance by smell alone?