"Walla Walla County in Washington state might just be the only place on Earth where you have to brake for bees.
"You can see the signs here," says Mike Ingham, as he drives by a 20 mph speed limit sign with a smaller one below stating "Alkali Bee Area."
"There's actually a county ordinance to slow the cars down who go by here, because a speeding car can kill a lot of alkali bees," Ingham says.
Mike Ingham is a third-generation alfalfa seed farmer outside Touchet, Wash. His family is one of about a dozen in the Walla Walla Valley responsible for producing a quarter of the country's alfalfa seed. That's a quarter of what's grown into one of America's biggest crops — and one that feeds cows and livestock the around the world. That might sound staggering, but they don't do it alone: They have millions of tiny, native helpers, thanks to one of the most unique agricultural partnerships in the country."