Two species of pelicans (Pelecanus crispus and Pelecanus onocrotalus), which used to nest in Serbia before but were driven out by draining of marshland for agriculture in the late 19th century, are back (not nesting yet, but some individuals are back) and you can see a picture of one of them here.
A journalist for ‘Birdwatch’ magazine went to the very first birding tour in Serbia back in 2004 and he wrote about his trip and his impressions.
This website provides a lot more information about birds and birding in Serbia. I wish that information was available to me when I was a kid living there. I went to several of the places mentioned there and I saw the birds, but I was never with anyone who knew how to identify them. There is still time to go back and do this….