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Tree Swallows

What do you call a guy who never farts in public?

A private tutor.

Interesting Fact: Tree Swallows have helped researchers make major advances in several branches of ecology, and they are among the best-studied bird species in North America. Still, we know little about their lives during migration and winter. ( https://www.allaboutbirds.org/guide/Tree_Swallow/lifehistory )