I'm pretty sure of the two plovers here, the others not so much. I think the first is a Black Bellied Plover, and the other plover a Piping. The two gulls, I do not know. The one gull was particularly large. One is maybe a Marbled Godwit? The most confusing picture to me is the one with the many birds on the sandbar. Are those Black Bellied Plovers too?