Well we don't know that. It could be that it is highlighted to attack it is a red indicator. Or it could be that you can have your queen go air like it appears to be.
I believe it's a Shrieker. The selected Huge Queen is probably just Burrowed near or underneath it to try and escape being attacked, as it looks like it's on very low health anyway.
No, cuz on the main, original image it shows they have the Queen selected. But to me that **** don't resemble a Queen at all, looks like a robot. Edit: I didn't see your post, Itza. Nice find
The thing that is highlighted is a Shrieker, evolved from a Creep Tumor (resembles to an eye wich protrudes from the creep). When you evolve a Creep Tumor, he will look like a little tower, acts like a detector and it shrieks(vibrate) when enemy units get near it.. here you go -> http://starcraft.wikia.com/wiki/Shrieker
yeah, i saw it and besides that thing looks more of an infested totem pole anyway so i guess its definitely no queen..