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American politician, 26th President of the United States

English naturalist and biologist

English chemist, theologian, educator, and political theorist

Prussian geographer, naturalist and explorer

Genevan philosopher, writer, and composer

German biologist, naturalist, philosopher, physician, and artist

American poet, essayist, naturalist, and abolitionist

British naturalist, explorer, geographer, anthropologist and biologist

Swedish botanist, physician, and zoologist

Scottish-American naturalist

American ornithologist, marine biologist, entomologist, and explorer

Italian erudite

British broadcaster and naturalist

German mathematician, astronomer and astrologer

American anthropologist, educator, philosopher, and natural science writer

English natural philosopher, architect and polymath

Canadian science writer

French chemist and microbiologist

American ornithologist, naturalist, and painter

Naturalist, zookeeper, conservationist, author and television presenter

American zoologist

German duke and naturalist

Roman military commander and writer

English ornithologist and ichthyologist

French painter

British marksman and naturalist

Austrian archduke

American biologist

British explorer, geographer, translator, writer, soldier, orientalist, cartographer, ethnologist, spy, linguist, poet, fencer, and diplomat

Swiss-mexicain naturalist

Australian zookeeper, conservationist and TV personality

French naturalist and zoologist (1769-1832)

British botanist and naturalist

French naturalist

British writer and trapper

Scottish botanist , discoverer of the cell nucleus and of Brownian Motion

French encyclopedist

Scottish publisher and writer

American explorer, soldier, Indian agent, and territorial governor