South Africa has culled nearly 2.5 million chickens in an effort to contain dozens of outbreaks of two separate strains of avian influenza that have threatened to create a shortage of eggs for consumers and are hitting an industry already struggling due to an electricity crisis, the government said on Tuesday. Another 205,000 chickens have died from bird flu in at least 60 separate outbreaks across the country, with more than half of those outbreaks in Gauteng province, which includes the country's biggest city, Johannesburg, and the capital, Pretoria.