|Osprey, Pandion haliaetus|
|4:40:15, both birds on nest|
|4:40:34, Bird on nest takes off and does rapid wide loop around valley|
|4:40:42, getting lined up|
|4:40:48, "Cloacal Kiss"|
If anyone has any more specific information about Osprey's mating feel free to add it in the comments. My impression was always that they mate for life but according to Sibley's "Guide to Bird Life and Behaviour" Osprey's may demonstrate polygyny. In any case they are beautiful raptors and here's a photo of the female (I assume the female is on the bottom?) from the sequence above. The pair at the zoo have a nestcam which can be found at the Enmax website.