r to lesser rhea, the only thing which differs is size and body mass. Greater Rhea is the largest bird in South America and 6th Largest bird in the world.
5. Emperor Penguin
Average mass : 31.5 kg, Maximum mass : 46 kg, Average total length : 114 cm
Emperor penguin which rules all other species with its weight and length. Emperor penguin weights about 31 kg, more than half of which is fat. Body fat behind the skin helps them to survive in the extreme winter of Antarctica (up to -65 degree C). An emperor penguin can grow up to 1.1 meters. Back portion and head of Emperor penguin are covered with the black waterproof feather which helps them to capture as much heat as possible from sunlight. Front portion of its body is covered by white waterproof feather. Neck portion of both male and female emperor has a whitish bright yellow feather.
Emperor Penguin lives around 20 years in the wild, but in an ideal condition they can live up to 50 years. Emperor penguin only lives in Antarctica and it’s surrounding ocean. Body weight and length puts Emperor in the Top 5 among top ten largest birds in the world.
Average mass : 33 kg, Maximum mass : 70 kg, Average total length : 153 cm
Emu, close relative to cassowaries species, is a flightless bird native to Australia. This is the national bird of Australia. Emus can reach up to a height of 2 m, which makes them second tallest amongst the birds. Emus have three sub-species, amongst them, two sub-species (novaehollandiae and woodwardi ) are widely found in several places in Australia throughout the country. Their main diet consists of fruit, seed, insects, some dead creatures like rodent, bird, insects etc.
3. Northern cassowary
Average mass : 44 kg, Maximum mass : 75 kg, Average total length : 149 cm
Also known as single-wattled cassowary, is a flightless bird with black plumage. A female is slightly larger than the male, weighing an average of 44 kg, making it the third heaviest bird in the world. It is found in the islands of Yapen, Batanta, and Salawati. Fruits and small animals consist of in their primary diet.
2. Southern cassowary
Average mass : 45 kg, Maximum mass : 85 kg, Average total length : 155 cm
Southern cassowary, also known as double-wattled cassowary, is the second largest bird in the world. They are unable to fly like Ostrich. It is primarily found in the tropical rainforests of Indonesia, New Guinea, and islands of northern Australia. It feeds on the fruits, insects, and vertebrates. The males incubate the eggs and rare the chicks alone.
Average mass : 104 kg, Maximum mass : 156.8 kg, Average total length : 210 cm
Ostrich is the largest living bird on Earth. Ostrich can not run with their heavy wings but they can run at high-speed with their strong long legs. Ostriches lay the biggest/heaviest eggs weighing about 1.4 kg. Historically Ostrich is an African bird but due to farming, they are also found in Australia and America. They consume mainly fruit, grass, flowers and even reptiles like snakes, lizards when occasionally available. Male ostriches are good fathers as they help to build nests, incubating the eggs and look after the chicks.
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