When Perry (in Candace's body) first enters his lair to receive his mission briefing, Major Monogram thinks that there has been a breach of security. Perry's most successful disguise might be that of when he and Candace accidentally switch bodies ('Does This Duckbill Make Me Look Fat?'). Curiously enough, however, once Doofenshmirtz has seen Agent P wearing the fedora, if Agent P removes it, Doofenshmirtz is still able to recognize him ('Get That Bigfoot Outta My Face!', ' Oil on Candace', ' I Scream, You Scream'). If Perry enters Doofenshmirtz's building without wearing the hat, the doctor will act surprised and exclaim 'A platypus?'. Doofenshmirtz does not recognize his enemy unless Perry is wearing his hat. (' Traffic Cam Caper')Дespite frequent contact with Perry, Dr. Perry has become adept in switching between his two guises and can perform the switch in rapid succession. During his stint as Perry the Teenage Girl, Perry continued to use this method to mask his true intelligence. Once he is certain that he is no longer being watched, Perry drops the facade and retrieves his secret agent hat, a fedora. His primary method to achieve this status is to direct each of his eyes outwards in opposite directions, creating the 'dumb' look. In order to prevent his family and other people from learning his identity, Perry takes steps to reinforce theperception that he is 'just a platypus', a mindless animal that doesn't 'do much'. Perry is the Flynn-Fletcher family's only pet (other than the deceased Bucky). Disney Channel Wiki has a collection of images and media related to Perry the Platypus.

Perry the platypus theme song