By ANDREA RODRIGUEZ, Associated Press PLAYA GIRON, Cuba (AP) — Every year in Cuba, millions of crabs emerge from the forest at the beginning of the spring rains and head for the waters of the Bay of Pigs, crossing streets and highways on a perilous journey to mate and reproduce. Now underway, the migration causes concern to drivers who try to swerve in an often futile attempt not to kill the crustaceans.