Scientific experiments to study animal behavior in various conditions (1925-1980)

A scientist conducts an experiment with a laboratory rat, releasing it from a cage.

The scientist gives the rat a baby, the rat runs away holding the baby in its teeth.

The face of the scientist.

A scientist conducts an experiment with a rat and its baby.

The rat turns a wheel with its front paws.

The rat returns to the cage.

The experimenter makes the rat walk on its hind legs.

Conducting an experiment with three rats.

A laboratory rat on the surface of a table.

Head of a monkey.

Baboons in a zoo enclosure.

A baby baboon sits on a fence post.

Baboons walk around the enclosure.

A monkey examines its reflection in a mirror, touches the surface of the mirror during an experiment.

A monkey rubs its back and the back of its head against the surface of the mirror.

A monkey grimaces in front of the mirror.

A chimpanzee climbs onto a chair, puts on an apron, and begins to drink tea from a cup with a spoon, imitating a human.

A chimpanzee, sitting at a table, pours water from a bottle into a glass, drinks from the poured glass, there is an abacus on the table and a telephone.

The chimpanzee puts on glasses, picks up the telephone receiver.

A family of baboons in a zoo enclosure.

View of a closed enclosure at the zoo.

A monkey rotates on a simulator for astronauts during an experiment.

A monkey examines parts of the equipment.

Scientists strap a monkey into a seat of a simulator.

A monkey during the rotation of the simulator.

Views of the room with a rotating simulator.

A monkey's hand on the handle of the simulator.

A monkey's face during an experiment.

A scientist closes the lid of the experimental chamber.