#Duck sounds download#

With the improvement of calls and calling techniques the more experienced callers do not use their voice to perform their techniques. In order for a hunter to make the feeding call, the hunter must say a quick repetition of 'tiki-tika' or 'duga-duga'. Hunters would use the air from their diaphragms into the call while saying 'hut', 'wuit', or 'oak' to make the single quack. The insert is the end in which the sound is produced. Early duck calls were simple woodwind instruments with a barrel, a sound board and ak that is used to hold the reed into place on the sound board, make up what is known as the insert. This is critical information for a species that inhabits a difficult to access sea-ice environment that is changing rapidly in some regions and has been the subject of contentious lethal sampling efforts and ongoing international legal action.As a tool, a duck call is like a traditional whistle made to emulate the sound of a duck. This finding allows the interpretation of a wealth of long-term acoustic recordings for this previously acoustically concealed species, which will improve our understanding of the distribution, abundance and behaviour of Antarctic minke whales. We analysed data from multi-sensor acoustic recording tags that included intense bio-duck sounds as well as singular downsweeps that have previously been attributed to this species. Here, we present conclusive evidence that the bio-duck sound is produced by Antarctic minke whales (Balaenoptera bonaerensis).

Heard mainly during austral winter in the Southern Ocean, this ubiquitous sound has been recorded in Antarctic waters and contemporaneously off the Australian west coast. Mysterious bio-duck sound attributed to the Antarctic minke whale (Balaenoptera bonaerensis), Biology Letters, Published 23 April 2014 DOI: 10.1098/rsbl.2014.0175įor decades, the bio-duck sound has been recorded in the Southern Ocean, but the animal producing it has remained a mystery. One is that they are a primary target of Japanese whalers, the other is because of where they live-a part of the ocean undergoing transformation due to global warming. Research on the minke whales is particularly important for two reasons. The researchers note that solving the mystery is more than fanciful, now that the source is known, researchers can use recording equipment to track their migration, feeding patterns or even the reproduction cycles of the whales, offering the possibility of a whole new research area. Recordings made of this and one other animal revealed that minke whales are the source of the mysterious and strange 'bio-duck' sound that is common in the Southern Ocean.

#Duck sounds download#

The suction cup tag detaches after a number of hours, then researchers retrieve the tag to download the data. The small green tag attached to this whale records depth, heading, and roll, and also has a microphone that records the sounds made by the animal and other sounds in the environment. One of two minke whales that researchers from Duke University outfitted with a suction cup tag. The recordings were compared to prior recordings of bio-duck sounds made by researchers aboard submarines and were found to match, solving the mystery of the bio-duck sounds.

A sensor on one of the whales gave away the secret of bio-duck sounds-capturing the distinctive bio-duck noise, repeating several times as the whale was near the surface. The sensors they used were quite sophisticated, yet small-they capture and record not only sound, but water depth and movements in 360 degrees-plus, they don't cause harm, they're held on by suction cups. Thus it was a bit of a triumph that the team was able to manage to do so. Putting sensors on minke whales is not easy-they're fast and turn on a dime. In this latest effort, the researchers took a direct approach-they attached sensors to the backs of two of the whales and captured data for 24 hour periods. Since that time, many scientists have heard and captured the noises, though until now, no one really knew from whence they came. Reports of seasonal bio-duck sounds have circulated since the 1960's, when they were first reported by personnel aboard submarines.