Virginia Zoo officials say the birth of a cassowary chick in Norfolk is one of only five such births in U.S. zoos over the past decade. Cassowaries are flightless birds native to the tropical forests of New Guinea, northeastern Australia and area islands. They’re among the largest birds, slightly smaller than the ostrich and emu. They have a reputation as the world’s most dangerous bird and are capable of inflicting serious injuries with their claws, but attacks are rare. Virginia Zoo official say Earline, a female cassowary, came from the National Zoo in January 2012 and was introduced into a shared habitat with the male cassowary Boris about a year later. The result was a chick that hatched June 11. The chick will be named after its sex is determined.