GS Soh documented the stages leading to a pair of Red-breasted Parakeet (Psittacula alexandri) mating in April 2009. It started when he saw the male parakeet flying around to perch on a branch of a tree. There he indulged in wing-foot stretching and calling loudly. At this, the female popped out of her nesting cavity to join her mate (above left). This was when copulation took place as he suddenly jumped on her back and indulged in a cloacal-kiss (above right; below).
This post is a cooperative effort between NaturePixels.org and BESG to bring the study of bird behaviour through photography to a wider audience.