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Top 10 Fattest Birds in the World

15/03/2025
in Animals, Articles
Top 10 Fattest Birds in the World
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Birds come in all sizes, but some are notable for their sheer bulk. From large flightless birds to waterfowl and seabirds, many species have evolved to become quite hefty over time. Their size and weight serve various survival purposes, including insulation, protection, and the ability to store energy. In this article, we explore the top 10 fattest birds in the world, detailing their weight, size, and the unique characteristics that make them stand out as some of the heaviest birds on the planet.

Top 10 Fattest Birds in the World

1. Ostrich (Struthio camelus)

The ostrich is the undisputed heavyweight champion of the bird world. Native to Africa, this flightless bird holds the title of the largest and heaviest bird alive today. Adult male ostriches can weigh up to 350 pounds (160 kg), while females are slightly smaller but still substantial, reaching around 290 pounds (130 kg).

Ostriches are not only the fattest birds but also the fastest on land, capable of running at speeds up to 72 miles per hour (116 km/h). Despite their size, ostriches are incredibly agile and can use their powerful legs for defense. Their thick legs can deliver powerful kicks that are capable of breaking bones.

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Their massive size comes in handy for their survival in the harsh African savannas and deserts, where they rely on their weight to intimidate predators and their running speed to outrun threats. Additionally, their large body helps them conserve heat during the cold nights and maintain energy reserves.

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2. Emu (Dromaius novaehollandiae)

The emu, native to Australia, is the second-largest living bird, and it is also one of the fattest birds in the world. Adult emus can weigh up to 130 pounds (59 kg), though most average around 100 pounds (45 kg). While emus are slightly smaller than ostriches, they share similar physical characteristics, including long legs, large bodies, and powerful builds.

Emus are flightless but are excellent runners, capable of reaching speeds of up to 31 miles per hour (50 km/h). They rely on their size and speed for protection, fleeing from predators rather than fighting. Despite their bulky frames, emus are highly mobile and can cover large distances in search of food. Their fat reserves play a crucial role in helping them survive in the often dry and harsh Australian outback, where food may not always be abundant.

3. Cassowary (Casuarius)

Native to the rainforests of New Guinea and northern Australia, the cassowary is a large, flightless bird known for its striking appearance and powerful legs. While their size varies, adult cassowaries can weigh as much as 187 pounds (85 kg). Their weight and impressive height, which can reach up to 6 feet (1.8 meters), make them one of the fattest birds in the world.

Cassowaries are known for their dangerous nature, using their sharp claws to defend themselves from predators or rivals. Their powerful legs can deliver lethal kicks, capable of disemboweling any threat. While they are not typically aggressive, their large size and strength make them formidable when cornered.

The cassowary’s size is largely an adaptation to its environment. Living in the dense rainforests, the cassowary’s bulk helps protect it from threats, and its weight allows it to store energy for long periods when food is scarce. It also helps them navigate the challenging terrain of the rainforest floor.

4. Greater Rhea (Rhea americana)

The greater rhea, often referred to as the “American ostrich,” is the largest bird in South America and one of the fattest birds in the world. Weighing between 55 to 85 pounds (25 to 40 kg), the greater rhea is a flightless bird with long legs and a strong build, similar to its African relatives, the ostriches and emus.

Greater rheas are excellent runners, capable of speeds up to 40 miles per hour (64 km/h). They are primarily herbivores, feeding on grasses and seeds, which contribute to their weight. Their large bodies help them navigate the open plains and grasslands of South America, where they can avoid predators by fleeing.

Despite their size, rheas are social birds, often found in flocks, especially during the breeding season. Their weight and size provide an advantage when defending their territory and protecting their young.

5. Kori Bustard (Ardeotis kori)

Native to sub-Saharan Africa, the kori bustard is one of the heaviest flying birds in the world. Males can weigh up to 42 pounds (19 kg), while females are typically smaller, weighing between 15 to 20 pounds (7 to 9 kg). This large bird is known for its robust frame and thick body, which make it one of the fattest birds in Africa.

The kori bustard’s weight is due in part to its large, muscular build. Despite being capable of flight, the kori bustard is primarily a ground-dwelling bird, spending much of its time foraging for food. It has powerful wings that allow it to take off when necessary, although it rarely flies for long distances. Its bulk helps it store energy, allowing it to survive in the sometimes arid and resource-scarce environments of southern Africa.

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6. Mute Swan (Cygnus olor)

The mute swan, with its graceful appearance and majestic white feathers, is also one of the fattest birds in the world. Mute swans can weigh up to 30 pounds (13.6 kg), with males typically being larger than females. They are known for their elegant swimming abilities and are often seen gliding across lakes and ponds in North America and Europe.

Mute swans get their hefty size from their diet, which consists mainly of aquatic plants, which they forage from the water’s surface. Their large bodies help them conserve heat during the colder months, making them highly adapted to life in temperate climates. Though mute swans can fly, they tend to be much more sedentary than other large waterfowl, often staying in their home territories year-round.

The swan’s weight is also beneficial when it comes to mating rituals, as males display their strength and dominance through physical displays that involve puffing out their chests and lifting their wings.

7. King Penguin (Aptenodytes patagonicus)

The king penguin is the second-largest penguin species, after the emperor penguin. Native to the sub-Antarctic islands, these birds can weigh between 24 to 40 pounds (11 to 18 kg). Their large size is essential for their survival in the frigid waters of the Southern Ocean.

King penguins rely on their size to help them retain warmth in the icy temperatures of their habitat. They are excellent swimmers, diving to great depths in search of food. Their weight helps them stay submerged for longer periods, as they can use their stored fat as energy reserves while swimming.

King penguins are also known for their impressive parenting skills, with both parents sharing the responsibility of incubating eggs and feeding their chicks. Their large size allows them to endure the harsh conditions of the Antarctic, where food sources can be scarce.

8. African Grey Parrot (Psittacus erithacus)

While most parrot species are small, the African grey parrot stands out as one of the larger and heavier species. Weighing up to 2 pounds (0.9 kg), the African grey parrot is known for its intelligence, as well as its relatively large body compared to other parrots.

These birds are famous for their ability to mimic human speech and communicate with their owners. Their weight, though not as massive as some of the other birds on this list, gives them a robust build that aids in their agility and stamina, allowing them to fly long distances and maintain their energy levels during the day.

African grey parrots are often kept as pets due to their social nature and highly developed cognitive abilities, making them a unique bird species in terms of both intellect and weight.

9. Wild Turkey (Meleagris gallopavo)

The wild turkey, native to North America, is a large bird known for its impressive weight. Males can weigh up to 30 pounds (13.6 kg), while females are typically smaller. Wild turkeys are omnivores and forage for a variety of food, including seeds, insects, and small plants, which contribute to their substantial weight.

Wild turkeys are strong flyers, capable of short bursts of flight, but they primarily rely on their size to protect them from predators. Their weight helps them resist colder temperatures during winter, and their strong legs allow them to quickly take flight when needed. Wild turkeys are also known for their distinctive gobble call and impressive displays of feathers during mating season.

10. Pelican (Pelecanus)

Pelicans, known for their large bills and distinctive pouch, are some of the fattest birds in the world. Depending on the species, pelicans can weigh between 10 to 30 pounds (4.5 to 13.6 kg). The largest species, the brown pelican, is known for its impressive size and strength.

Pelicans are excellent at diving for fish, using their large bills and pouches to scoop up their prey. Their size and weight help them maintain energy reserves, especially during long flights across coastal regions. Pelicans’ large bodies and ability to fly over large distances make them one of the most recognizable birds in coastal areas around the world.

Conclusion

The world of birds is home to a fascinating array of creatures, many of which have evolved to be extraordinarily large and heavy. From the towering ostrich to the massive cassowary, these birds use their size and weight in different ways to adapt to their environments and ensure their survival. Whether it’s for protection, endurance, or energy storage, the top 10 fattest birds in the world all share one common characteristic: they are built to survive in some of the most challenging conditions on Earth. Their impressive size is a testament to the diverse ways that birds have evolved to thrive in their respective habitats.

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