Liam

Looks like an Elaenia species.

Perhaps a female Becard species?

I would guess a young male White-necked Jacobin: http://ibc.lynxeds.com/files/pictures/im...

One of the tyrant flycatchers, but considering the number of species in Brazil is so incredibly diverse, I wouldn't be able to say which.

http://en.wikipedia.org/wiki/List_of_bir...

Squared head and "angry" expression suggest Cooper's.

This one looks more like a Parasitic Jaeger with the extensive pale on the belly and the grayish vent.
However, differentiating Jaegers is not easy without clear photos and I have no experience with them in the field myself.

It is a molting Jaeger sp., likely Pomeraine, but very difficult to say from these pictures.

The long, angular bill and long, skinny wings indicate Gannet.

Sceloporus sp.? http://en.wikipedia.org/wiki/Sceloporus

Sceloporus sp.: http://en.wikipedia.org/wiki/Sceloporus