Who doesn’t love dolphins? These charming animals can even become an inspiration for movies, slots at Bet22, and masterpieces. Are you also into dolphins? Then 5 these tips will surprise you.
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Dolphins Evolved From Terrestrial Animals
Dolphins, like other cetaceans, were the result of the evolution of a terrestrial ancestor. This is evidenced by many traits. For example, dolphins and whales are mammals and livebearers, their fin bones are similar in structure to the limb bones of land animals, in addition, they breathe with their lungs rather than with their gills, which is why they have to float to the water surface.
The earliest ancestor of modern cetaceans, the pacicete, lived about 48 million years ago and was a terrestrial predator that adapted to search for food in water. According to scientists, the hippopotamus family is one of the offshoots of cetacean evolution.
Dolphins have some of the most sophisticated acoustic abilities in the animal kingdom. To communicate, these extremely social animals, which live in packs, make various sounds, including whistling, clicking, squealing, squeaking and moaning. In doing so, they use certain individual sounds to identify each other, which can be considered a kind of analogy of “names.
Sound is also a key factor for dolphins to navigate in space – this is called echolocation. So underwater noise pollution from human marine activities, the oil and gas industry, seismic surveys and underwater construction interfere with their ability to navigate and search for prey.
Not All Dolphins Live in the Seas
We often think of dolphins as sea creatures, but in fact there are five species of dolphin that live only in freshwater rivers.
For example, the Amazon and Orinoco have the Amazon dolphin Inia geoffrensis, the Ganges dolphin Platanista gangetica, the Indus River has the Platanista minor, the La Plata River has the Pontoporia blainvillei in its waters, and the Yangtze River has the Chinese dolphin Lipotes vexillifer.
At the same time, river dolphins are on the verge of extinction: their populations are small, and they often encounter various artificial objects because of their poor eyesight. Another threat to the survival of river species is hunting by humans
Dolphins Are as Smart as Primates
In fact, they are considered the second most intelligent mammals after humans.
The brain size of a dolphin relative to its body size is even larger than that of a chimpanzee, in addition, the brain of an average dolphin weighs about 1.7 kg, while an average human could weigh 1.4 kg. The number of gyrations in the cerebral cortex in dolphins is also more than in humans, and by half.
Dolphins are one of the few species whose members can recognize their reflection in the mirror, which is a sign of high intelligence. In addition, dolphins – one of the few animals capable of using the “tools”: for example, living in the Gulf ofark in Australia, representatives of the family can cover their “nose” sea sponges to protect themselves from sharp rocks during the hunt.
Dolphins Are Fast
Dolphins are capable of phenomenal speed: for example, dolphins can accelerate up to 48 km/h for a short period of time, and a bottlenose dolphin can cover 60 km in an hour. For the first time attention to the unusually high speed of these mammals drew the Englishman James Gray in the 1930s.
He found that, according to the laws of hydrodynamics, dolphins must have much more muscular strength than in reality in order to move at such a speed (then, according to his calculations, it was 37 km / h).