Penguins may not fly , but they are exceptional swimmers, capable of holding their breath for nearly 30 minutes and swimming at remarkable speeds
Ostrich is the largest flightless bird, weighing up to 290 pounds and capable of running at 43 mph. Its inability to fly is an evolutionary adaptation, as its ancestors chose to live on the ground
Kakapos, or owl parrots, are flightless birds with fewer than 200 left in the world, and they possess a musky, sweet scent
Kiwis can't fly because of their one-inch wings. Evolving on predator-free islands, they lost the need for flight, but their populations have declined due to new predators
Cassowaries are large birds with a blue head and neck. Their size prevents flight, and they were once considered the most dangerous bird
Emu is a notable flightless bird, closely related to ostriches but smaller. With blue heads, they can grow up to 6 feet tall and are very protective of their families
Scytalopus birds inhabit mountainous areas and, while flightless, run fast. Their stout bodies, short tails, and grey-to-black plumage help them blend into dense vegetation