LOS ANGELES—It was a quilling experience for all. Percy, a porcupine puppet of prodigious proportions, emerged from her giant stump home for an audience of schoolchildren and media members at a Los Angeles park on Tuesday. The adorable beast inspired oohs and awwws as she blinked her droopy eyes and opened her mouth to show her buck teeth. She stood nearly two stories tall with a nose the size of a car. A joint project of the San Diego Zoo Wildlife Alliance and Jim Henson’s Creature Shop, Percy was let out to celebrate next week’s opening of the zoo’s new Wildlife Explorers Basecamp. Six months in the planning, the puppet is modeled on the prehensile-tailed porcupine, native to South America. It has a circumference of nearly 40 feet, and has 2,000 foam quills that it took a house-worth of paint to put stripes on. “We’ve done some fantasy creatures a …