Assertion: turkey vulture | /r/HasProperty | found to number 1.73 pair per 10 km2
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Source sentences:
text: In Poland, buzzards productivity was correlated to prey population variations, particularly voles which could vary from 10–80 per hectare, whereas goshawks were seemingly unaffected by prey variations; buzzards were found here to number 1.73 pair per 10 km2 (3.9 sq mi) against goshawk 1.63 pair per 10 km2 (3.9 sq mi).