Oolong was, of course, best known for his ability to balance things on his head, which Hironori refers to as tougei (頭芸), or "head performance":
After gaining widespread attention through this page on Syberpunk, Oolong garnered his very own Wikipedia entry, was featured in the New York Times, and even inspired copycats. It’s perhaps not much of an exaggeration to say that he brought joy to thousands of people around the world.
Sadly, Oolong died on January 7, 2003. But Hironori soon obtained a new rabbit, Yuebing, to carry on the head-balancing tradition. Apparently, after a rocky start, Yuebing was making some progress:
I have no idea what's become of Yuebing or her owner. An email I sent to Hironori has thus far gone unanswered. I hope they're both well. If anyone has any leads or information, please let me know.