The first one is shaped like a tern, but I'd never seen them heckling an osprey before. But then again, there are more terns around lately.
We watched that last one hunting small bugs on (and crapping all over) our windshield for hours. In the full-res photo, you can make out fine details on his legs, feet and abdomen. Very cool. Not sure who would have won the fight if I went out there to swat him. He flew away sometime after we got underway. I think I heard him calling the tower for clearance to take off.