The second killer whale born in captivity arrived Friday to the cheers of thousands of spectators awaiting a scheduled show at Sea World of California, officials said.

The premature, but healthy baby whale of undetermined sex is the second calf born to Shamu, spokesman Dan LeBlanc said. The first of Shamu's offspring, Baby Shamu, was born at Sea World three years ago.The new calf was not immediately named.

Shamu gave birth at 5:20 p.m. in full view of thousands of people attending a show scheduled to start at 5:30 p.m., LeBlanc said.

The father, Orky, has resided at Sea World since Marineland in Los Angeles went out of business in February 1987, LeBlanc said.

"It's breathing and looking good," said LeBlanc, adding that Shamu's offspring are the only killer whales born in captivity.