I don't know if it's done on purpose, but the sound of some animals is strange and not very immersive. Here I detail each of them and the sound they currently make.
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The Mallard has no sound in its mating call.
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The Harlequin Duck has no sound in its mating call.
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The Cinnamon Teal has no sound in its mating call.
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The Ferruginous Duck has no sound in its mating call.
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The Gadwall has no sound in its mating call.
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The Dusky Grouse makes the Black Grouse's warning call.
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The Northern Pintail makes the Mallard's call while traveling and has no sound in its mating call.
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The Wood Duck makes the Mallard's call while traveling and has no sound in its mating call.
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The Snow Goose makes the Canada Goose's call while traveling and has no sound in its mating call.
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The Magpie Goose makes the Greylag Goose's call while traveling.