Assertion: mockingbird's subspecie | /r/HasProperty | brown thrasher
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Source sentences:
text: There are two subspecies: the 'brown thrasher' (T. rufum rufum), which lies in the eastern half of Canada and the United States, and the 'western brown thrasher' (T. rufum longicauda (Baird, 1858)), which resides in the central United States east of the Rocky Mountains and southern central Canada.