The largest bird in the world is the ostrich, which can grow up to 9 feet tall and weigh up to 350 pounds. They are flightless birds, native to Africa, with strong legs and long necks. Ostriches are also known for laying the largest eggs of any bird, which can weigh up to 3 pounds. They are primarily herbivores and can survive in harsh and arid environments. Due to their size and strength, ostriches have few natural predators in the wild.