Dyer’s chamomile (Anthemis tinctoria) is a hit with the Ridge-saddled carpenter bees (Heriades troncorum). They fly on and off. Pounding their abdomen they collect the pollen on the flowers.
The local spiders are not blind to all this activity. Small light yellow species lurk underneath the flower heads. Larger crab spiders go to less trouble to hide, patiently waiting on top of the petals. The urge for the bees to forage is strong, so there is always one, or even two, for whom the spider is invisible or simply ignored. Often this goes surprisingly well, unfortunately not on all occasions.
References1 Nederlands Soortenregister