Ostrich is the largest bird in the world, but it is the hummingbird is a small bird in the world. Ostrich are Black Brown and white only. Hummingbird part, there will be a green, red, yellow, blue, vary. Ostrich is flat and wide mouth with a tapered spikes and hummingbird. Ostrich has a long neck, short neck with hummingbird hummingbird has the ability to store and release energy within his body, which has no ostrich.