From the September 4, 1937, issue

ENRAGED GRIZZLIES GROWL AS 50,000 VISITORS STARE

The angry grunts of enraged grizzly bears are a common sound at the Yellowstone National Park feeding grounds at mealtime. During July, more than 50,000 people packed themselves into the feeding enclosure to witness a show seen nowhere else on Earth. The enclosure is used to keep the public out; not to restrict the bears.