Dude who's probably the zookeeper smoking a pipe and feeding two American black bears at the Lincoln Park Zoo. (1900)

Security guard with plaster, wood, and metal moon model. (1898)

Elmer S. Riggs and Mr. Klein with fossil rhinoceros skull in Paleontology Lab (check out all the stuff spilling from the drawers!). (1899)

Carl Akeley with a bandaged arm and the dead leopard that he killed with his bare hands. Africa Expedition, 1896.

Hall 35, Paleontology: Glyptodon, ground sloth, turtle, guard, and visitor. (1895)

Tinish, an orphaned baboon, gets a ride on a man named Allamayu's shoulder during a 1926-1927 Africa expedition. (1927)

Six unidentified carpenters, one tiny cat, and an unidentified male statue leaning against the column outside the Field Columbian Museum. (1914)

Hall 26, Ornithology: The Field Columbian Museum had snowy owls before they were cool (shown with ptarmigan and arctic fox). (1899)

Fighting African elephants being transported by rail from the Field Columbian museum to the new site in Grant Park. (1920)

Museum director Frederick J.V. Skiff in his office. (1895)

May 2, 1921: Opening day at the Field Museum in Grant Park. (1921)

A 1920's advertisement suggesting visitors take the Illinois Central railroad to the museum. (1929)

Moving a bird exhibit case to the new museum site. (1920)

Security guard resting on this specimen of smithsonite from the Morning Star mine, Oklahoma. (1906)

Two-toed sloth, photographed during Cornelius Crane's expedition to the South Pacific. (1928)

Milton Copulos, plant model maker, trimming model leaves for the vanilla vine model in the Botany Plant Reproduction Laboratory. (1913)

Display cases en route to the new museum site, being moved using a tramway. (1920)

Young cheetah growling at the camera during an 1896 Africa expedition. (1896)

Hall 36, Paleontology: On the right is a megalodon jaw ("Hands Off") with modern shark jaw for comparison. Other specimens include deer and a hadrosaur. (1895)

Late 19th century taxidermy: large mammals and cats in glass exhibit cases and in a diorama group at the Field Columbian Museum. (1899)

Hall 62, Systematic Mineralogy, featured meteorites and a guard in white gloves. (1895)

Lt. Colonel John Patterson, who killed the Man-Eating Lions of Tsavo, shown here in Kenya (he's the one with the dog). (1898)

This is a Babylonian hedgehog-shaped rattle from 550 B.C. photographed next to an actual hedgehog. (1928)