Sweary the Swan

Sweary the Swan   is a swan and   Perry the Platypus's counterpart in the "Phineas and Ferb" episode " Steampunx".

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Like Perry, he is normally acting like a "mindless swan" in front of Phineasand Ferb, but he has the double life of secret agent fighting Professor Von Doofenshmirtz. He is frequently accused of swearing by everyone who hears him, though to the viewer's ear he seems to simply makes normal swan noises.