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American politician, 26th President of the United States

American ornithologist, marine biologist, entomologist, and explorer

American zoologist

Austrian archduke

British writer and trapper

British/ American author, artist, and a founder of the scouting movement

American ornithologist

French prince

English mycologist and naturalist

American writer and scientist

British scientist

English taxidermist, naturalist and folklore collector

Explorer and naturalist

British entomologist, zoologist

French astronomer, naturalist, alpinist and speleologist

American mammalogist, bacteriologist, and pathologist

American ornithologist

Archéologue, préhistorien et protohistorien français.

American entomologist, botanist, scientific collector and teacher

American naturalist

Swiss physician, ethnographer, naturalist and botanist

American ornithologist, naturalist, and Director of the San Diego Natural History Museum

American scientist and explorer

American taxidermist, sculptor, biologist, conservationist, inventor, and nature photographer

American zoologist and botanist (1866–1948)

Memoirist, novelist, poet, essayist, critic, playwright

French artist

American Holy Cross priest, author, scientist, and South American explorer

German naturalist, writer and hunter

British naturalist

American artist, taxidermist, naturalist, museum curator

Russian botanist and naturalist (1880-1942)

Swiss naturalist

American artist and writer

English naturalist

Italian conservationist

Brazilian professor, librarian, dentist and naturalist

German philosopher