Checking the bluebird boxes found this nice surprise. Inside were three?, maybe four, newly hatched baby Tree Swallows, Tachycineta bicolor.
Photo by Wikipedia
The little ones will grow up to be one of the prettiest iridescent birds alive. I absolutely love the brilliant color that shimmers in the sun! They are so entertaining, swooping and diving after the flying insects near their nest box. I will truly enjoy watching these nestlings this summer.