Figure 1. Sketch of the flight paths of male bumblebees (Bombus hortorum) by Charles Darwin. Observations were made between 1854–1861 on the grounds of Darwin’s home in Downe (Kent, UK). For several successive years, bees appeared to follow the same routes (dotted lines) linking plants and several “buzzing places.” Image from,¹ with permission of the Natural History Museum of London.