A seven-year-old yellow Protoceratops, B.J. has been on the show since September 27, 1993. He is Baby Bop's older brother. He sings the song "B.J.'s Song" about himself. He wears a red baseball cap and red sneakers. He lost his hat in the episode "Hats Off to B.J.!", and sometimes says things to hide his fears (for example, in the episode "Barney's Halloween Party", he was shocked by the paper spiders and after learning they were fake, he said "I knew that, sort of"). Pickles are his favorite food and because of that, he actually has had them in different ways such as on pizza (also with pepperoni, peppers, pineapple, and peanut butter).