Thousands of square miles of Appalachian hardwood trees surround the Beech Fork Lake area, providing a habitat for wood warblers, vireos, thrushes, chats, cuckoos, ovenbirds, and many other forest dwelling birds.
Historically, the Least Bell's Vireo was a common to locally abundant species in lowland riparian habitat, ranging from coastal southern California through the Sacramento and San Joaquin Valleys as far north as Red Bluff in Tehama County.
Three of these species, the Swallow-tailed Kite (Elanoides forficatus), the Piratic Flycatcher (Legatus leucophaius), and the Yellow-green Vireo (Vireo flavoviridis), reproduce in Monteverde and migrate to South America during their non-reproductive phase.
The Plumbeous Vireo (Vireo plumbeus) is a small North American songbird, ranging from far southeastern Montana and western South Dakota south to the Pacific coast of Mexico, including the extreme southern regions of Baja California Sur.