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Electric fish can detect electrical signals using tuberous electroreceptors which are sensitive to high-frequency stimuli. Electroreceptors exist in different forms and can be found in various parts of the body. Sharks, for example, have electroreceptors called ampullae of Lorenzini in the pores on their snouts and other zones of the head ...
Dolphinarium in Harderwijk, the Netherlands, Dutch newsreel from 1966. Though cetaceans have been held in captivity in both North America and Europe by 1860—Boston Aquarial Gardens in 1859 and pairs of beluga whales in Barnum's American Museum in New York City museum— [3] [4] dolphins were first kept for paid entertainment in the Marine Studios dolphinarium founded in 1938 in St. Augustine ...
Sharks display recognizable sequences of behaviour, which mimic the initial phases of their fight sequence, to signal their degree of agitation, along with their intent to fight. [ 14 ] [ 4 ] [ 2 ] [ 1 ] The stereotyped postures and movements displayed by the shark are subsequently interpreted by competing organisms as honest, predictive ...
For example, dolphins may be seen porpoising away from their main predator, sharks [14] or the direction of incoming boats to avoid collision. [ 15 ] Although porpoising is a useful product of rapid swimming, much variation seen in the behaviour cannot be explained by this cause alone; it has likely evolved to provide other functions.
Scientists trying to understand the hunting behaviors of bottlenose dolphins have come up with a unique solution: fit them with video cameras.
A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
You can see dolphins about 80-90% of the time on a dolphin sightseeing tour. According to Richardson, the best time to go earlier in the day to see dolphins, because the ocean waves will be calmer.
Like other aquatic mammals, they do not represent a biological grouping. [26] The humpback whale is a fully aquatic marine mammal. Marine mammal adaptation to an aquatic lifestyle vary considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate ocean dwellers.