Birds that cannot fly
Emu

The Emu is a large, flightless bird from Australia. It is the second-biggest bird in Australia and the third-biggest bird in the world only the ostrich and cassowary are bigger.

Emu can reach up to 2 metres in height. Emus can travel great distances at a fast, economical trot and, if necessary, can sprint at 50 km/h (31 mph) for some distance at a time.
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Emus weigh between 18 and 55 kilograms. The emu's life span is 10-20 years.
 
Kiwi

Kiwi are by far the smallest living ratites and lay the largest egg in relation to their body size of any species of bird in the world. Kiwi eggs can weigh up to one quarter the weight of the female.

This territorial bird is about the size of a chicken and lives in pairs. It has a life span of up to 40 years.
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This bird has no tail. Kiwis range from 18 to 33 inches (45 to 84 cm) long and are about 1 ft (30 cm) tall. They weigh from 2 3/4 to 9 pounds (1.25 to 4 kg).
 
Cassowary

The cassowaries very large flightless birds in the native to the tropical forests of New Guinea, nearby islands and northeastern Australia. There are three extant species recognized today. It is the third tallest and second heaviest living bird, smaller only than the ostrich and emu.

Cassowaries grow to be about 6.5 feet (2 m) tall and weigh about 130 pounds (60 kg).
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Cassowaries are predominantly frugivorous, but they will take flowers, fungi, snails, insects, frogs, birds, fish, rats, mice, and carrion.
 
Tahake

The Takahe is a flightless bird indigenous to New Zealand which was thought to be extinct after the last four known specimens were taken in 1898. However, after a carefully planned search effort the bird was rediscovered on November 20, 1948.

The Takahe is the largest living member of the Rallidae; its overall length is up to 63 cm (24.8 in) and its average weight is about 2.75 kg (6 lbs), ranging from 1.8-4.2 kg (4-9.2 lbs).
Tahake
It is a stocky bird, with reduced wings, strong legs and a massive bill. Takahe can live up to twenty years
 
Ostrich

The ostrich is the largest and heaviest bird that is alive today is also the fastest running bird today. The ostrich lays the biggest egg in the world.

Ostriches usually weigh from 63 to 130 kilograms (140–290 lb) with exceptional male Ostriches weighing up to 155 kilograms (340 lb). Their lifespan is up to 40 or 45 years.

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They mainly feed on seeds, shrubs, grass, fruit and flowers;occasionally they also eat insects such as locusts.
 
Penguin

Penguins are a group of aquatic, flightless birds living almost exclusively in the southern hemisphere, especially in Antarctica. Penguins are birds that cannot fly, but they swim very well and spend most of their lives in the sea.

The largest living species is the Emperor Penguin: adults average about 1.1 m (3 ft 7 in) tall and weigh 35 kg (75 lb) or more.
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The smallest penguin species is the Little Blue Penguin, also known as the Fairy Penguin, which stands around 40 cm tall (16 in) and weighs 1 kg (2.2 lb).

Most penguins feed on krill, fish, squid, and other forms of sealife caught while swimming underwater.
 
Rhea

Rheas are large, flightless birds with gray-brown plumage, long legs and long necks, similar to an ostrich. Males can reach 1.50 metres (4.9 ft), and weigh up to 40 kilograms (88 lb). Unlike most birds, rheas have only three toes.

They are omnivorous and prefer to eat broad-leafed plants, but also eat seeds, roots, fruit, lizards, beetles, grasshoppers, and carrion.
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Birds

Birds that cannot fly
Eagles and their types
Falcons and their types
Owls and their types
Parrots and their types
Pigeons and their types
Eggs & incubation periods of birds
Birds of Amazon Basin

 
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