Board Thread:Questions and Answers/@comment-26198584-20141024201907/@comment-64.113.119.123-20141116041155

It could be an unidentified Bloon. No Bloon has been seen with a metal skeleton, though I may be wrong. It's surface contains a gray, bland design with stripes. It might be a long since decayed blimp, and looking at the Zomg on the right, this is definitely larger.