Tom's Bird Feeders Sibley's Peregrine Falcon Adult T-Shirt Size XL Featuring the artwork of celebrated ornithologist, author, and illustrator David Allen Sibley this 100% preshrunk cotton ash colored t-shirt beautifully illustrates the Peregrine Falcon in full flight. The juvenile plumage and several adult plumages are also depicted on this shirt. Graphics printed with water-based ink.