When Natasha was teaching little Masha her animals, she would ask her "riddles" about them. (ex. "Now, what animal waddles around and quacks and swims in a pond?" "A duck!") One time, Natasha asked Masha, "Now, what's big and strong and furry and has a big appetite and sleeps very deeply?" Masha beamed innocently and said "Papa!" and pointed to Pierre. Natasha had to end the lesson for the day because she couldn't stop laughing, and Pierre started jokingly calling the kids "his little cubs."