Eastern Bluebirds Nesting [NARRATED]

Eastern Bluebirds were brought back from a spiral toward extinction by a widespread campaign to build bluebird houses. That's fortunate for those of us who like to watch these striking birds bringing bugs and caterpillars to the nest box.
Thanks to Lisa Saffell for filming her gerryrigged sunshade for me, for permitting me to use her House Wren shot, and for sharing her story about it. Thanks to the following videgraphers for the use of their footage of mammals nursing: Mark Formo (   • 2019-03-21 - Wild Horse Foal Nursing  ), Michael Bayerl (   • Lamb nursing  O, The Station (   • Starving Hungry Puppies Nursing On Mo...  ), openmindtutorials45 (   • Видео  ), James Zimmerman (   • Lamb Nursing  ). Thanks to Backyard Birds for footage of a House Sparrow on a bluebird box (    • Why are House Sparrows an Invasive Sp...  ).