Each year, Great Blue Herons nest in trees along the Bitterroot River, including a rookery at the Lee Metcalf National Wildlife Refuge. The males set up the nests and invite the females to lay their eggs in the tops of some of the valley's tall trees. Great Blue Herons are found throughout North America. In between the weather systems, they have been flying this month. Mike Daniels shows us a few of the huge birds (see photos below).

Herons in a tree. (Mike Daniels, Townsquare Media)
Heron, low over a Metcalf Refuge pond. (Mike Daniels, Townsquare Media)
Great Blue Heron, passing by. (Mike Daniels, Townsquare Media)
Great Blue Heron. (Mike Daniels. Townsquare Media)