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Film negatives showing cave paintings
Fireweed fruiting showing bunting pod and down seeds
Fireweed near Larsen's
Fireweed, one stalk
Fireweed, one stalk
First bridge over the Mississippi River
First bridge over the Mississippi River
First house on the Mississippi River, John Korth's residence
Fisher tracks in snow
Fisher tracks in snow
Fish Hawk nest on tall dead tree trunk
Fish Hawk, Osprey, from a mounted illustration from "Bird Life" by Frank M. Chapmn
Fishing shack and boats, Lake Superior, North Shore
Five members of the University Bird Class eating lunch at Frank Commons' house
Five young hawks
Five young hawks
Flamingo, bill of young and old illustration from William Beebe, "The Birds Its Form and Function"
Flamingo feeding young, image from Frank M. Chapman, "Camps and Cruises of an Ornithologist"
Flamingo flight, from Frank M. Chapman, "Camps and Cruises of an Ornithologist"
Flamingo in nesting colony, image from "Birds of the World"
Flamingo nests, image from Frank M. Chapman, "Camps and Cruises of an Ornithologist"
Flamingo on nest, image from Frank M. Chapman, "Camps and Cruises of an Ornithologist"
Flamingo tongue in lower mandible from William Beebe, "The Bird Its Form and Function"
Flash Picture of Chickadee
Flash pictures of Cottontail Rabbit
Flash pictures of Cottontail Rabbit
Flash pictures of Cottontail Rabbit
Flash pictures of Raccoons
Flash pictures of Shrew
Flash pictures of Shrew
Flash pictures of Shrew
Flash pictures of Shrew
Flicker
Flicker
Flicker
Flicker
Flicker, breast toward camera
Flicker feeding young at hole
Flicker head, tongue extended
Flicker, Sapsucker, injury done, image from U.S. Department of Agriculture, Bulletin 39
Flicker, young in hole
Flicker, young in hole
Flies on bark of tree at Sapsuckers punctures, movie film
Flight, illustration from Frederick Webb Headley, "The Flight of Birds"
Flight origin, illustration from Henry Fairfield Osborn, "The Origin and Evolution of Life"
Flight, wing motions in progression, illustration from Frederick Webb Headley, "The Flight of Birds"
Flood scene at Brook Lodge
Florida Gallinule (Common Gallinule), juvenile
Florida Gallinule, Coot, illustration, plate 28 in Birds of Minnesota
Florida Trip, boat in water