The golden birdwing provided a striking clue to the natural origin of species.
Dutch draper Antonie van Leeuwenhoek (1632–1723) built microscopes that allowed him to observe never-before-seen microorganisms, including this rotifer. He called them “animalcules.”
The skull of Zinjanthropus is one of the first early hominid fossils found in Africa and provides essential clues in the story of human evolution.
As a student of divinity at Cambridge University, Charles Darwin was an enthusiastic collector of beetles
Adventurer naturalist Roy Chapman Andrews (center) inspects a nest of fossil dinosaur eggs in the Gobi Desert, Mongolia in 1925.