10 + 3 Aves mais Perigosas do Mundo

10 + 3 Most Dangerous Birds in the World
When you think about birds, you probably think of small, cute animals flying through the air, swooping down to reach their nest. Maybe you think of those “pretty” song birds in the morning. However, not all birds are cute, and not all of them are nice, so to speak. There are hundreds of birds that could attack a human, and do a lot of damage.

1. Cassowaries

Cassowaries, an endangered species, are large, flightless birds that live in the rainforests, woodlands and swamps of Australia. 

Cassowaries are unpredictable, aggressive and are known to kick up their large, clawed feet. Their kicks are capable of breaking bones, and their claws have been likened to daggers.

2. Ostriches

Ostriches are suspicious, skittish and can be dangerous. They're the largest living bird (they can reach over 9 feet tall and 350 pounds) and they can outrun you (a steady 30 miles an hour for 10 miles straight). Like the cassowary, they have strong legs (their kick can kill a hyena) and sharp claws.

3. Canada Geese

Canada geese are very aggressive and, particularly if you (purposely or inadvertently) come near their nests or young, they may chase you away and even bite you.

4. Seagulls

Seagulls are extremely aggressive and are known to attack and even peck at people's heads to protect their nests and young. In fact, in Britain people have been forced to carry umbrellas to avoid the attacks, at least one woman was taken to an emergency room with deep beak wounds to her head, and a pet dog was killed by the birds.

5. Owls

Owls are raptors, or birds of prey, and they use their talons and beaks to kill and eat their catch. In a closed space, or if the bird was scared or agitated, it could cause serious harm to you.

6. Hawks and Falcons

Also birds of prey, the sharp talons and beaks that hawks and falcons use to hunt, along with their quick speed and agility, pose serious dangers to humans, even if the birds are just babies (falcons' beaks are also specially configured to cut through the spinal cords of their prey).

7. Eagles

Eagles are strong (strong enough to carry away something that weighs four pounds), aggressive birds, and although they don't pose much of a danger to humans in the wild, in a closed space their beak and talons could easily harm a human. (FYI, they can eat about a pound of fish in just four minutes.)

8. Vultures

If cornered, a vulture (many species of which are now endangered) may hiss or make a low grunting sound at you. They, of course, also have sharp, hooked beaks that can tear meat, along with excellent eyesight.

9. Rheas

The rhea, native to South America, is a large, flightless bird that can grow to be 60-80 pounds. Though smaller than ostriches and not as aggressive as cassowaries, rheas have heavily muscled legs, hard spurs on their feet and their kicks can bring a force of 800 pounds per square inch.

10. Pitohui (toxic)

Pitohuis are brightly coloured, omnivorous birds. The skin and feathers of some pitohuis, especially the Variable and Hooded Pitohuis, contain powerful neurotoxic alkaloids of the batrachotoxin group (also secreted by the Colombian poison dart frogs, genus Phyllobates). These are believed to serve the birds as a chemical defence, either against ectoparasites or against visually guided predators such as snakes, raptors or humans. The birds probably do not produce batrachotoxin themselves. The toxins most likely come from the beetle genus Choresine, part of the birds' diets. Due to their toxicity, Papua New Guineans call the pitohuis rubbish birds as they are not good for eating; in desperate times, though, they can be consumed but only after the feathers and skin are removed and the flesh is coated in charcoal and then roasted.

11. Blue-capped Ifrit (toxic)
The Blue-capped Ifrit, like the Hooded Pitohui, sequesters batrachotoxin in its skin and feathers, which causes numbness and tingling to those who handle the bird. The toxin is acquired from part of its diet, specifically Choresine beetles.

12. Little Shrikethrush (toxic)
During a study of the toxicity of the genus Pitohui, two specimens of this species have been tested. One of the two specimens did have traces of batrachotoxins (BTXs) similar to those found in the secretions of Central and South American poison dart frogs.

13. Common Quail (toxic by diet-dependent)
Coturnism is an illness featuring muscle tenderness and rhabdomyolysis (muscle cell breakdown) after consuming quail that have fed on poisonous plants.
From case histories it is known that the toxin is stable as four-month-old pickled quail have been poisonous. Humans vary in their susceptibility; only one in four people who consumed quail soup fell ill. The toxin is apparently fat-soluble as potatoes fried in quail fat have proved poisonous.
Coniine from hemlock consumed by quail has been suggested as the cause, though quail resist eating hemlock. Hellebore has also been suggested as the source of the toxin. It has also been asserted that that evidence points to the seeds of the Annual Woundwort (Stachys annua) being the causal agent. It has been suggested that Galeopsis ladanum seeds are not responsible.

Source: wikipedia.org and others sites...

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