Umwelt Suggests That Every Animal Experiences the World Differently — and it Can Change How We Study Them

The concept of umwelt, introduced by biologist Jakob Uexküll in the early 20th century, illustrates how all creatures perceive their surroundings uniquely. Often translated as "environment," the German term "umwelt" more accurately denotes "surrounding world." According to Uexküll, an organism’s perceived experience is determined by its physiological senses, which allows for a subjective, self-centered understanding of the world. This idea is reshaping how scientists approach the study of animal behavior.

Uexküll's concept of umwelt contrasts with the notion of ecological niche, which focuses on an organism's habitat requirements for survival. Instead, umwelt emphasizes the self-centered, subjective world experienced by each animal. An animal’s umwelt is unique and private, making it impossible for humans or other animals to experience another's umwelt.

Despite this, researchers continue to explore umwelt through various methods. For instance, a tick's world revolves around the scent of butyric acid on mammal skin, warmth, and the flow of blood into its body. Bats navigate by sonar, while great white sharks sense prey movements through their lateral line organ. These specialized worlds highlight the diversity of animal experiences.

In the 1934 booklet, "Rambles through the Environments of Animals and Humans," Uexküll used the tick as an example of how umwelt operates. However, he also viewed umwelt through the lens of functional cycles, like the tick's cycle of smelling, burrowing, and feeding. By mapping these cycles, biologists can gain insights into an animal's umwelt, albeit from a third-person perspective.

The emergence of ethology in the early 20th century sought to study animals within their environments. Konrad Lorenz, often called the father of ethology, was heavily influenced by Uexküll's ideas. However, in the second half of the 20th century, research shifted towards laboratory conditions, raising concerns about the validity and replicability of study results, as well as the isolation of animals from their natural contexts.

Contemporary biologists advocate for an "integrative biology of behavior" that incorporates the concept of umwelt. By understanding animals in their natural environments and drawing inferences about their unique worlds, researchers can develop a more comprehensive and enlightened approach to studying animal behavior.