The pictures of the cactus flowers themselves, and the pictures of the butterflies themselves, there are no pictures of the butterflies perched on the cactus flowers. It's just that these two types of images were taken at the same location, on a sandy beach near the sea in Aceh. The cactus is of the species Opuntia vulgaris or Opuntia monacantha, which is also known by the common name as the drooping prickly pear, and the butterfly is Danaus chrysippus, or by its common name, the plain tiger. There are two plain tigers and they are doing mate, the other one seems to be carrying its partner, which sometimes has to swing because of the wind or because of the movement of the partner above.
