Hilly, forested area for the mark-recapture study with Chelostoma florisomne in north-eastern Switzerland. The four artificial nesting sites within the two forest clearings are labelled with the letters A to D. Black areas show the mapped Ranunculus stands which were grouped into 19 patches (white circles). White lines indicate the foraging flights of recaptured females with the numbers referring to the individual flights listed in Table I.