Assertion: spur winged goose | /r/CapableOf | treat in its own subfamily
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Source sentences:
text: The Spur-winged Goose, (Plectropterus gambensis), is a large bird in the family Anatidae, related to the geese and the shelducks, but distinct from both of these in a number of anatomical features, and therefore treated in its own subfamily, the Plectropterinae.