Swerry the Swan

 is the steampunk counterpart of Perry the Platypus. Much like Perry, Swerry acts like a mindless swan when around his owners, Phineas and Ferb. As soon as they leave, he puts on a bowler hat and gets instructions from Major Megaburns about what his nemesis, Professor Von Doofenshmirtz is up to. Every time he squawks, it sounds as if he is using coarse language, causing Von Doofenshmirtz to call him "Swear-y the Swan".

Appearances

 * "Steampunx"

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