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A layout boat is a low-profile un-motorized oval-like boat that is used by diver duck hunters to hide in when hunting in open water. They are unique to a specialized form of waterfowl hunting called Layout hunting. Most layout boats are used for diver duck or ocean duck hunting where open deep water waterfowl species frequent.
A duck call may be either the sound-imitation process used in waterfowl hunting, by which a hunter lures waterfowl, or the actual tool which the person uses to do so. Early duck call tools were basic woodwind instruments, while later innovations are constructed of rubber and plastic, and allow the hunter to adjust the volume and tone of the ...
This page was last edited on 14 February 2025, at 22:57 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Bat call frequencies range from as low as 11 kHz to as high as 212 kHz. [20] Insectivorous aerial-hawking bats, those that chase prey in the open air, have a call frequency between 20 kHz and 60 kHz, because it is the frequency that gives the best range and image acuity and makes them less conspicuous to insects. [21]
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The greater scaup (Aythya marila), just scaup in Europe or, colloquially, "bluebill" in North America, [3] is a mid-sized diving duck, larger than the closely related lesser scaup and tufted duck. It spends the summer months breeding in Iceland , east across Scandinavia , northern Russia and Siberia , Alaska , and northern Canada .
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Multibeam sonars project a fan-shaped set of sound beams outward into the water and record echoes in each beam. These have been widely used in bathymetric surveys, but have recently begun to find use in fisheries acoustics as well. Their major advantage is the addition of a second dimension to the narrow water column profile given by an ...
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