Military dolphins squeak for joy after having struck a toxic sea snake

Dolphins with video cameras that are strapped to them were absorbed in excited noises when they conquered prey, including yellow -bellied sea snakes, in which San Diego Bay and the open ocean.

The two marine dolphins that cameras were on their sides were the first to watch the hunt and recording of prey in a natural environment with sound and video. This film material made it possible to compare scientists to compare the dolphins’ noises with the behaviors they showed.

According to a study published in the PLOS One magazine, dolphins that were looking for their prey made different noises when they approached and when they conquered their soon to be paid. They constantly kept their eyes on the prey.

dolphin
Dolphin S, a dark blend of dolphin that is involved in the study, attached to the left side of her belt with a camera. The camera filmed its behavior and also recorded their vocalizations so that the researchers compare how the two are linked.
2022 Ridgway et al. / Plus one

One of them was also observed how eight yellow -belly sea snakes were consumed, which is a toxic way that was never observed by dolphins. It didn’t get sick.

Dolphins vocalize for a variety of reasons, often for the echolocation in the hunting prey. It is assumed that the click rate of these vocalizations increases when it approaches an object of interest. They communicate with each other with their vocalizations and even have signature pipes in their social group, almost similar to a name.

“The camera placements used by us could be used with small cameras and suction taps to observe feeding in wild dolphins. This would give a better understanding of feeding and nutrition in endangered populations,” wrote the authors of paper.

During the hunted prey, the dolphins clicked at intervals of 20 to 50 milliseconds. These were in a terminal sum (a number of faster successive clicks that sound like a high sum) and then a squeak when the dolphin approached a potential catch. When the dolphin recorded the prey and ate, these squeak continued and varied in the long run, lace frequency and amplitude.

The Terminal sum and squeaking continued, even when the fish escaped and the dolphin pursued. When the eye of a dolphin was visible in the video, the researchers found that it was always turned towards fish.

Dolphin
Left: Dolphins dig into the seabed to grab a fish. The arrow shows that the eye has turned to the fish. Right: Delphin S expresses the fish with lips in the rear half of the Gape area to show the upper row of teeth and the Gular surface.
Ridgway et al., 2022, Plos One, CC-BY 4.0

“Simultaneous sound and video of all prey on the suction events and some fish that were captured showed that echolocation was used to find prey in the distance, and the vision, which was unveiled by eye tracking, was also used,” wrote the authors in the study.

The San Diego Bay dolphins were observed in several sessions of about 50 minutes and set firmly fishing from the vicinity of the sea floor and five near the surface, while the other caught on the floor 36 and four on the surface.

The cameras learned two different methods of using the dolphins. The dolphins could be seen as they opened their mouth and exposed their teeth for the preparation for feeding, where they sucked a prey in the mouth, as well as the feeding of the ram, where the dolphin overtakes the prey and closes the mouth around them.

Brittany Jones, scientist at the National Marine Mammal Foundation The guard: “These findings are an incredible addition to the literature that provides detailed analyzes during the prey on the open ocean, which would be very difficult to achieve with wild dolphins.”

news week contacted the authors of the paper.

https://www.newsweek.com/dolphins-squealing-hunting-fish-filmed-1734873 Military dolphins squeak for joy after having struck a toxic sea snake

Rick Schindler

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