Help with Tern ID

http://s273.beta.photobucket.com/user/eve_jean_talbot/library/Birds HiI took some photos and video of the terns on the rocks near the Beach Road Boat Ramp at Western Treatment Plant on 18/2/13.Thanks to the people who reported them being there.Among the Crested, Little, Fairy and (one) White-winged Black tern were two birds i’ve had some trouble identifying.I’ve put two photos of one bird and one photo and some video of the other bird on the link above. If anyone can advise me on what they are it would be appreciated.ThanksNickPS: I have higher definition versions of the photos and video if required. Photo 1 – Photo 2 – (the bird from Photo 1 is on the far left) Photo 3 – Video 1 – (Is of the bird from photo 3) ===============================

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