Endangered condors soar over Grand Canyon - Boston.com - Science - News
A couple of graphs:
On some days, as many as 25 to 30 condors soar over the canyon area -- more birds than were in existence a generation ago when officials decided to capture and breed them
"There are some challenges we deal with, primarily people management more than bird management," said Olson, who sometimes waves his arms to scare the birds if they come too close to the crowds gathered on the rim.
But the canyon's rim is attractive to the birds, in part because there is so much activity and because they are so curious, he said.
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