7 Most Dangerous Jellyfish in the Underwater World

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Portuguese boat (Physalia physalis)

The second name for jellyfish is physalia. Although this is rather not even a jellyfish, but a whole colony of polypoid and medusoid individuals. The «bite» of a Portuguese boat is extremely dangerous and painful (sensations are compared to hitting the skin with a whip). The main risk is the systemic effects of the poison. In severe cases, intense pain is followed by fever, shock, and impaired heart and lung function, which can lead to death. Physalias are accustomed to moving in groups of up to 100 colonies, and sometimes in resorts they have to close entire beaches because of them!

ANIMALS 10 Interesting Facts About Hedgehogs

10 Interesting Facts About Hedgehogs

For many people, hedgehogs are associated with cute prickly animals that drag apples and mushrooms on their backs into a hole. In fact, the hedgehog is a predator that eats everything that it can find. And this is far from always mushrooms and berries ...
INTERESTING TOP 10 Attack Helicopters of the World And the Present

TOP 10 Attack Helicopters of the World And the Present

For half a century, attack helicopters have made a significant contribution to the total strength of the military forces of various countries. Impact helicopters are capable of hitting ground, sea and even air targets. Such helicopters carry a deadly threat to any tank or other armored unit of military equipment. Most countries have long equipped their military forces with similar “machines” and some of them even entered the ranking of world leaders ...