Not Purple Martin TeeNot Purple Martin Tee Any true birder knows the great irony of the Purple Martin: its notoriously glossy dark blue and black, not actually purple! This funny, highly detailed tee sets the record straight. It features a beautiful, vintage style illustration of our favorite swallow holding a tiny protest sign to declare the facts once and for all. Whether you're actively monitoring your backyard martin houses or just out running errands, its a