Assertion: mallard's foot | /r/HasProperty | 4,000 m
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Source sentences:
text: Many bird species live in habitats that are over 13,123 feet (4,000 m) above sea level, and others routinely fly to altitudes of approximately 10,000 to 13,000 feet (3,000 to 4,000 m), especially when they're migrating, said Graham Scott, an assistant professor of biology at McMaster University in Ontario, Canada.