Birdfeeders are designed to keep unwanted guests away

The first birdfeeders were made in the 19th century, and their design rapidly evolved during the 20th century. Researchers at the consider the evolution of the birdfeeder to be an example of multispecies design, where unwanted guests have shaped the human-made artifact.

https://www.sciencedaily.com/releases/2024/04/240409124025.htm