Assertion: eagle's leg | /r/CapableOf | help explain the belief
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text: Mayor's hypothesis suggests that unfamiliar fossils exhibiting bird and mammal features – beaks, four legs, and eggs in nests – can help explain the belief recorded in numerous Greek and Roman sources from Herodotus and Aeschylus to Pliny, Pausanias, and Aelian that griffins were real animals observed in the deserts along the Silk Route and might also help account for the proliferation of reports and illustrations of griffins that began after the 7th century BC.