Analysis of information sources in references of the Wikipedia article "Karl von Frisch" in English language version.
Karl von Frisch (1914) was the first to demonstrate in behavioral experiments of this kind that bees possess a true color sense. He demonstrated that honeybees are able to distinguish a blue-colored card-board from a series of cardboards which appeared grey to the human eye.
Karl von Frisch (1914) was the first to demonstrate in behavioral experiments of this kind that bees possess a true color sense. He demonstrated that honeybees are able to distinguish a blue-colored card-board from a series of cardboards which appeared grey to the human eye.