![]() Once a potential prey item was detected, porpoises adjusted their inspection distance from the remote target throughout their approach. The inspection distance was long enough to ensure a wide safety margin before facing real risks or rewards. ![]() The porpoises inspected distances up to 77 m, whereas their swimming distance without using sonar was less than 20 m. In this study, we analysed the biosonar behaviour of eight free-ranging finless porpoises (Neophocaena phocaenoides) and demonstrated that these animals inspect the area ahead of them before swimming silently into it. 1 In 2014 the Supreme Executive of the Order of Royal Purple decided to secede from the Elks and start a new organization, the Canadian Royal Purple Society. A newly developed miniature data logger attached to a porpoise allows for individual recording of acoustical search efforts and inspection distance based on echolocation. The Order of Royal Purple was founded in Vancouver, British Columbia in September 1914. Dolphins and porpoises are known to actively use sonar or echolocation. The Kingdom of Hawai’i was established in 1810 by King Kamehameha I of the House of Keua Nui at the capitulation of all the other island chiefs. However, to date few studies have considered how animals in the wild focus their attention. Information about the Royal Orders of the Hawaiian Kingdom. ![]() ![]() Potential risks and rewards, such as prey, predators, conspecifics or non-biological obstacles, must be detected so that an animal can modify its behaviour accordingly. Detecting objects in their paths is a fundamental perceptional function of moving organisms. ![]()
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