Crikey! Only Robert Irwin can bring out Jimmy Fallon's wild side.
The 13-year-old conservationist returned to The Tonight Show Thursday after making his debut on the show in February. His first visit reached 54 million people on Facebook—an impressive number for any star, let alone one one who's fairly new to the international spotlight. "It was such an honor to be on the show," Robert told Jimmy. "One of the friends who was traveling with us at the time kept going, 'Look! It's up to 10 million! Look! It's at 20 million!' It was an incredible experience for me, so thank you so much for having me back. We have so much fun."