Least Flycatcher - Empidonax minimus
The very broad bill of the flycatcher family maximizes the chances of seizing at least some part of an airborn insect. The short bill of the Least Flycatcher evolved to capture gnats and midges. By comparison the bill of the kingbird evolved to capture dragonflies, bees, and beetles. These birds have rictal bristles around the base of the beak. The function of these bristles is poorly understood.
References
The Atlas of Breeding Birds of Alberta. Federation of Alberta Naturalists. 2007.
Baicich PJ, Harrison CJO. Nests, Eggs, and Nestlings of North American Birds. Princeton UP. 2005.
Beadle D, Rising J. Sparrows of the United States and Canada. Princeton UP. 2003.
Fisher C, Acorn J. Birds of Alberta. Lone Pine Publishing. Edmonton. 1998.
Sibley David A. The Sibley Guide to Bird Life and Behavior. Alfred A Knopf, Inc. New York. 2001.
Tudge Colin. The Bird. Crown Publishers. New York. 2008.
References
The Atlas of Breeding Birds of Alberta. Federation of Alberta Naturalists. 2007.
Baicich PJ, Harrison CJO. Nests, Eggs, and Nestlings of North American Birds. Princeton UP. 2005.
Beadle D, Rising J. Sparrows of the United States and Canada. Princeton UP. 2003.
Fisher C, Acorn J. Birds of Alberta. Lone Pine Publishing. Edmonton. 1998.
Sibley David A. The Sibley Guide to Bird Life and Behavior. Alfred A Knopf, Inc. New York. 2001.
Tudge Colin. The Bird. Crown Publishers. New York. 2008.
No comments:
Post a Comment