Climate change is real (someone please tell Donald, but use simple terms) and some European birds are spreading further north. In the 1980s it was little egrets and now there are increasing sightings of cattle egrets. It is possible that the lovely bee-eater will soon be quite common in the UK. The number of sightings is rising and they have bread in the UK in recent years. I've seen them in southern Europe, but never (yet) in the UK. They are stunningly beautiful birds.
There are several different sorts around the world.
See http://www.bbc.co.uk/news/uk-england-nottinghamshire-40428787 .