Los Angeles Zoo on Instagram: "Ostriches are the world’s largest and heaviest bird, which contributes to the fact that they can’t fly. So why do they have wings? Although ostriches have evolved from flighted ancestors, their wings and feathers are still important as they use them for balance when running, for courtship displays, for protecting their eggs and hatchlings, and to warm up or cool down."

China's Ostrich Industry Exposed – The Process Behind Millions of Birds