Assertion: trumpeter swan's call | /r/HasProperty | likened to the sound of a french horn
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Source sentences:
text: The trumpeter swan's call is more vociferous than that of the tundra swan and has been likened to the sound of a French horn.
text: The tundra swan's call is high-pitched and reminiscent of snow geese, while the trumpeter swan's call is more vociferous and has been likened to the sound of a French horn.