The Sunspire why do piranha plant have bone in it?

Benry stumbled over his words for a moment, and Umi couldn't help but bow her ears and twitch her whiskers sympathetically. He was so at a loss. It was this charming befuddlement that made her think, he is so cute. As he tried to explain, he only confused her. It seemed to be that he thought he couldn't "do cubs" because he physically couldn't birth them, which had her politely chuckling until he finished by asking a question. At that point, she burst into laughter.

I, heh— she giggled while trying to speak. I'm sorry, I just.. Didn't your mom ever give you 'the talk'? She looked at him expectantly, tilting her head. She was definitely not the one who could possibly tell him if he..didn't know. She was sure he would just naturally figure it out anyway.