8.8K views · 698 reactions | Tree Swallow checking out the house!...

2.5M views · 10K reactions | American Tree Swallow constructs her nest piece by piece so spectacularly 殺 | Nest Box Live | Facebook

Migrating and wintering Tree Swallows can form enormous flocks numbering in the hundreds of thousands. They gather about an hour before sunset and form a dense cloud above a roost site (such as a cattail marsh or grove of small trees), swirling around like a living tornado. With each pass, more birds drop down until they are all settled on the roost. (Source: Cornell Lab All About Birds) 📸 Gina Sanders, mid-morning on North Beach, Seabrook Island. #seabrookislandclub #seabrookislandsc #seabrook