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An Unnamed robe-wearing platypus appears in a flashback told by Grandpa Fletcher. Dr.Phineastein and Ferbgor came across the platypus and it gave Ferbgor a steering wheel, which is ironic because they didn't mind about the platypus walking and selling them stuff. ("The Monster of Phineas-n-Ferbenstein") The episode says they were collecting spare parts from semi-aquatic mammals. This is the only time the cloth-wearing platypus appears. It maybe an ancester of Perry