Background: Aristotle noted that cranes traveled from the steppes of Scythia to marshes at the headwaters of the Nile. Pliny the Elder, in his Historia Naturalis, repeats Aristotle's observations.
Question: What kind of bird did Aristotle and Pliny the Elder write about?
Answer:<extra_id_0>.
<extra_id_0> cranes<extra_id_1>