This is Pernode.

It's late summer in Canada, and this Swison Hawk is about to embark on an astonishing journey.

Every year, they travel 12,000 miles round trip between their grassland breeding grounds in Western North America

and their wintering territories in the Pampas Plains of Argentina.

During fall migration, Swindon's hawks form massive flocks with other migratory raptors,

sometimes numbering in the tens of thousands, creating a river of raptors

that flow from southern Mexico to Panama and beyond.

Soissons' hogs are related to red-tailed hogs, but they are more slender, about the size of a muller

duck, and have long, pointed wings that span nearly four feet.

Though they mostly hunt small mammals in the summer,

Sorensen's hogs feast almost exclusively on insects like grasshopers and locusts while in South America.

That's actually what gives them their name in Argentina,

Agilucho Langostero, or Grasshopper Hawks.

These beautiful birds have hunted bugs for millennia,

but recent agricultural practices have put them both at risk.

In the 1990s, pesticides in Argentina killed over 20,000 swains and hogs in just two years.

The tragedy propels scientists from the U.S. and Argentina to join forces.

They banned the pesticides preventing more deaths and gradually allowing bird populations to recover.

The more than 800,000

raisin hugs, now soaring

across the Americas, are leaving

proof that when we choose to act,

...