The Peterson Identification System is a practical method for the field identification of

animals Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motilit ...

, plants and other natural phenomena. It was devised by

ornithologist Ornithology is a branch of zoology that concerns the "methodological study and consequent knowledge of birds with all that relates to them." Several aspects of ornithology differ from related disciplines, due partly to the high visibility and th ...

Roger Tory Peterson Roger Tory Peterson (August 28, 1908 – July 28, 1996) was an American naturalist, ornithologist, illustrator and educator, and one of the founding inspirations for the 20th-century environmental movement. Background Peterson was born in Jame ...

in 1934 for the first of his series of ''Field Guide''s (See

Peterson Field Guides The Peterson Field Guides (PFG) are a popular and influential series of American field guides intended to assist the layman in identification of birds, plants, insects and other natural phenomena. The series was created and edited by renowned ornit ...

.) Peterson devised his system "so that live birds could be identified readily at a distance by their 'field marks' without resorting to the bird-in-hand characters that the early collectors relied on. During the last half century the binocular and the spotting scope have replaced the shotgun." As such, it both reflected and contributed to awareness of the emerging early

environmental movement The environmental movement (sometimes referred to as the ecology movement), also including conservation and green politics, is a diverse philosophical, social, and political movement for addressing environmental issues. Environmentalists a ...

. Another application of this system was made when Roger Tory Peterson was enlisted in the US Army Corps of Engineers from 1943 to 1945. “...plane identification—the aircraft spotting technique—was based on Roger’s bird identification method-the Peterson system.”.Devlin, John C. and Naismith, Grace (1977), “The World of Roger Tory Peterson An Authorized Biography”,Times Books, pg 105.

The system

Created for use by amateur naturalists and

laymen In religious organizations, the laity () consists of all members who are not part of the clergy, usually including any non-ordained members of religious orders, e.g. a nun or a lay brother. In both religious and wider secular usage, a layperson ...

, rather than specialists, the "Peterson System" is essentially a pictorial key based upon readily noticed visual impressions rather than on the technical features of interest to scientists. The technique involves patternistic drawings with arrows that pinpoint the key field comparisons between similar species.

Influence

Since the first Peterson ''Field Guide'', the system has been expanded to about three dozen volumes in the series as well as being emulated by many other publishers and authors of

field guide A field guide is a book designed to help the reader identify wildlife (flora or fauna) or other objects of natural occurrence (e.g. rocks and minerals). It is generally designed to be brought into the " field" or local area where such objects e ...

s. It has become the near-universally accepted standard, first in the United States and Europe and then around the world.

References

Biological literature Natural history Wild animals identification {{ecology-stub