I want to briefly promote the good work that is done by the guys from Gull Research who have recently added a new (and long awaited) section about the Caspian Gull (Larus cachinnans).
As usual, various characteristics (such as plumage types, distribution, observations, sound recordings, etc) are discussed in-depth for each month of each age group (1st, 2nd, 3rd and 4th calendar year and adult).
Information is based on various publications and an incredible number of photographs.
If you ever wanted to get to grips with this beautiful gull species then start your journey here:
http://gull-research.org/cachinnans/01cyaug.html
One of the images that you will find on the Gull Research pages is of this second-calendar year Caspian gull in second-winter (first cycle) plumage, present at a sand suppletion site at Texel, The Netherlands, 14 March 2012.
Gulls to the Horizon 