They've given up the wonderful art of flying. Or was it an art they never possessed? Often weighing around 200 kg, standing over 2 meters tall, and capable of reaching speeds of 70 km/h, these runners have secrets! The largest bird in the world lives in Africa: the ostrich. Its slightly smaller colleague, the emu, conquered Australia. And hanging out down under is the dazzling cassowary.

They've given up the wonderful art of flying. Or was it an art they never possessed? Often weighing around 200 kg, standing over 2 meters tall, and capable of reaching speeds of 70 km/h, these runners have secrets! The largest bird in the world lives in Africa: the ostrich. Its slightly smaller colleague, the emu, conquered Australia. And hanging out down under is the dazzling cassowary.