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The Biologists ClipArt gallery offers 28 portraits of people who have made contributions to the fields of biology, botany, zoology, and natural history.

American scientist and engineer

Alexander Agassiz

American scientist and engineer

American scientist and engineer

Alexander Agassiz

American scientist and engineer

A Swiss innovator in the study of the Earth's natural history.

Louis Agassiz

A Swiss innovator in the study of the Earth's natural history.

(1807-1873) Swiss-American geologist and naturalist famous for his study of glaciers.

Louis John Rudolph Agassiz

(1807-1873) Swiss-American geologist and naturalist famous for his study of glaciers.

Frederick Augustus Porter Barnard was an American scientist and educationalist. He was the president of Columbia College from 1864 – 1889.

Frederick Augustus Porter Barnard

Frederick Augustus Porter Barnard was an American scientist and educationalist. He was the president…

American writer and naturalist.

John Burroughs

American writer and naturalist.

(1688-1776) Physician, scientist and public official.

Doctor Cadwallader Colden

(1688-1776) Physician, scientist and public official.

(1840-1897) Distinguished American naturalist

E. D. Cope

(1840-1897) Distinguished American naturalist

(1769-1832) Cuvier was a naturalist and devoted to many departments of natural and scientific research.

Georges Cuvier

(1769-1832) Cuvier was a naturalist and devoted to many departments of natural and scientific research.

An English naturalist who established that all species of life have descended over time from common ancestry. He proposed the theory of natural selection and evolution.

Charles Darwin

An English naturalist who established that all species of life have descended over time from common…

(1890-1882) Naturalist known for his theories of Evolution and Natural selection

Charles Robert Darwin

(1890-1882) Naturalist known for his theories of Evolution and Natural selection

James Hutton MD was a Scottish geologist, physician, naturalist, chemist and experimental farmer. He is considered the father of modern geology.

James Hutton, M.D.

James Hutton MD was a Scottish geologist, physician, naturalist, chemist and experimental farmer. He…

(1825-1895) British biologist that had many studies in medicine and marine life. He was a supporter of Darwinism and intrduced the term "agnostic" viewpoint.

Thomas H. Huxley

(1825-1895) British biologist that had many studies in medicine and marine life. He was a supporter…

British biologist who defended Darwin's theory of evolution. He is known as "Darwin's Bulldog." Huxley also coined the term "anosticism" describing his religious beliefs.

Thomas H. Huxley

British biologist who defended Darwin's theory of evolution. He is known as "Darwin's Bulldog." Huxley…

{1825-1895) English biologist known as "Darwin's Bulldog" for his advocacy of Charles Darwin's theory of evolution.

Thomas H. Huxley

{1825-1895) English biologist known as "Darwin's Bulldog" for his advocacy of Charles Darwin's theory…

(1811-1875) American scientist and naturalist. Created a catalogue of plants and shells found in the vicinity of milwaukee on the west side of Lake Michigan.

Increase A. Lapham

(1811-1875) American scientist and naturalist. Created a catalogue of plants and shells found in the…

(1823-1891) American naturalist and physician

Joseph Leidy

(1823-1891) American naturalist and physician

(1452-1519) Famous Italian polymath who was a successful scientist, mathematician, engineer, inventor, anatomist, painter, sculptor, architect, botanist, musician, and writer.

Leonardo Da Vinci

(1452-1519) Famous Italian polymath who was a successful scientist, mathematician, engineer, inventor,…

(1834- ) English banker and scientist

Sir John Lubbock

(1834- ) English banker and scientist

Great naturalist who announced that brachiopods were not to be classed under mollusks but under worms.

Edward Sylvester Morse

Great naturalist who announced that brachiopods were not to be classed under mollusks but under worms.

John Muir (April 21, 1838 – December 24, 1914) was a Scottish-born American naturalist, author, and early advocate of conservation of U.S. wilderness.

John Muir

John Muir (April 21, 1838 – December 24, 1914) was a Scottish-born American naturalist, author,…

(1838-1914) American geologist, naturalist, explorer, and one of the first preservationists.

John Muir

(1838-1914) American geologist, naturalist, explorer, and one of the first preservationists.

(1822-1895) French chemist and biologist

Louis Pasteur

(1822-1895) French chemist and biologist

Charles Willson Peale (April 15, 1741 – February 22, 1827) was an American painter, soldier and naturalist.

Charles Wilson Peale

Charles Willson Peale (April 15, 1741 – February 22, 1827) was an American painter, soldier and…

(1820-1903) Spencer was an English philosopher, biologist, sociologist, and prominent classical liberal theorist of the Victorian era.

Herbert Spencer

(1820-1903) Spencer was an English philosopher, biologist, sociologist, and prominent classical liberal…

"The famous English evolutionist, Herbert Spencer, was born in Derby in 1820." —The Popular Cyclopedia, 1888

Herbert Spencer

"The famous English evolutionist, Herbert Spencer, was born in Derby in 1820." —The Popular Cyclopedia,…

Henry David Thoreau (born David Henry Thoreau; July 12, 1817 – May 6, 1862) was an American author, naturalist, transcendentalist, tax resister, development critic, sage writer and philosopher. He is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay, Civil Disobedience, an argument for individual resistance to civil government in moral opposition to an unjust state.

Henry David Thoreau

Henry David Thoreau (born David Henry Thoreau; July 12, 1817 – May 6, 1862) was an American author,…

(1823-1913) English naturalist

Alfred Russel Wallace

(1823-1913) English naturalist