What has the author Karl von Jan written?

You're likely thinking of Karl von Frisch, not Karl von Jan. Karl von Frisch was a renowned Austrian ethologist who won the Nobel Prize in Physiology or Medicine in 1973.

He is best known for his research on the communication of honey bees, particularly their use of the "waggle dance" to convey information about food sources. Here are some of his most notable works:

* Aus dem Leben der Bienen (1927) - A comprehensive study of bee behavior, translated as The Dancing Bees (1953).

* The Language of the Bees (1953) - This book popularized Frisch's findings about bee communication and established him as a leading figure in ethology.

* Animal Architecture (1974) - Explores the construction techniques and adaptive strategies of various animal species.

There is no known author named Karl von Jan.