Dolphins, porpoises and, in general, toothed whales, such as orcas, use a sensory system called echolocation that allows them to emit sound waves and interpret the echoes they generate when they bounce off objects in their environment, such as prey. In this way, they can determine the distance at which it is, its position, size and even recognize the surrounding terrain.
Scientists at the University of St Andrews (Scotland) have shown that dolphins use specific acoustic signals to each other that allow them to make and respond to individual calls. The research sheds new light on the amazing intelligence of these cetaceans, a subject already discussed in previous reports.
Orcas, whales, dolphins ... in the world there are more than 80 species of cetaceans, a group of very peculiar mammals because they live in water, and do not need to be on land to perform any of their vital functions. Tea
When dolphins sleep, only one hemisphere of their brain rests, while the other half remains on alert. This ability to switch the brain hemispheres to sleep is known as unihemispheric sleep and, as scientists from the National Marine Mammal Foundation of the United States have just demonstrated in a study published in the journal PLOS One, it allows them to remain fully active and retain their fullness. faculties for at least 15 consecutive days.
An analysis of several dolphins found dead on Brazilian beaches reveals that the animals had traces of pyrethroid insecticides, frequently used in homes and agricultural crops. The highest concentrations have been found in the offspring, less prepared to metabolize these compounds. The study is published in the journal Environmental International.
No, but almost. Researchers from the Department of Zoology at the University of Hawaii and the Russian Academy of Sciences have found that whales and dolphins adjust and reduce their hearing to protect themselves from excess noise when they anticipate a loud sound, a finding that may lead to ways to avoid that are affected by the one that produces human activity.
The dolphins are organized in bands that establish alliances or ruptures with other groups with the main objective of defending their females. These 'mobster' societies reveal a high cognitive level, according to the authors of a study, published in the Royal Society Journal Proceedings B, which analyzes the complex social structures of these intelligent mammals.
Dolphins never cease to amaze us with their extraordinary communication skills. Not only are they able to understand human commands or imitate the sounds of other animals, but they also use individual whistles to "introduce themselves" when they meet their peers.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.
