Knut was born at the Berlin Zoo to 20-year-old Tosca, a former circus performer from East Germany who was born in Canada, and her 13-year-old mate Lars, who was originally from the Tierpark Hellabrunn in Munich.
Knut's need for round-the-clock care required that Dörflein not only sleep on a mattress next to Knut's sleeping crate at night, but also play with, bathe, and feed the cub daily.