 The dorsal and pelvic fins are angular , with the first dorsal fin larger than the second . The pectoral fins are narrow , pointed , and falcate ( sickle @-@ shaped ) ; their shape separates this species from the similar @-@ looking nurse shark . The origin of the first dorsal fin is about even with the origin of the pelvic fins , while the origin of the anal fin is even with or somewhat behind the origin of the second dorsal fin . The caudal fin has a shallow upper lobe and barely present lower lobe , comprising about a quarter of the total length in adults . The dermal denticles are diamond @-@ shaped , bearing 4 – 5 faint ridges radiating from a blunt point . Tawny nurse sharks are yellowish , reddish , or grayish brown above and off @-@ white below , and are capable of slowly changing their color to better blend with the environment . Young sharks have starkly white lower eyelids . 
 The dorsal and pelvic fins <a href='drop_aux' title='1'><mark>are</mark></a>angular , with the first dorsal fin larger than the second . The pectoral fins are narrow , pointed , and falcate ( sickle @-@ shaped ) ; their shape <a href='uninflect' title='2'><mark>separates</mark></a> this species from the similar @-@ looking nurse shark . The origin of the first dorsal fin is about even with the origin of the pelvic fins , while the origin of the anal fin is even with or somewhat behind the origin of the second dorsal fin . The caudal fin <a href='got' title='3'><mark>has</mark></a> a shallow upper lobe and barely present lower lobe , comprising about a quarter of the total length in adults . The dermal denticles <a href='drop_aux' title='4'><mark>are</mark></a>diamond @-@ shaped , bearing 4 – 5 faint ridges radiating from a blunt point . Tawny nurse sharks <a href='drop_aux' title='5'><mark>are</mark></a>yellowish , reddish , or grayish brown above and off @-@ white below , and <a href='drop_aux' title='6'><mark>are</mark></a>capable of slowly changing their color to better blend with the environment . Young sharks have starkly white lower eyelids . 
The dorsal and pelvic fins angular , w da first dorsal fin larger than tdasecond . Thdaectoral fins r narrow , pointed , and falcate ( sickle @-@ shaped ) ; their shape separate dis species from thedamilar @-@ looking nurse shark . The origin of the first dorsal fin is about even with the origin of the davic fins , while the origin of the ada fin is even with or somewhat behind the ordan of the second dorsal fin . The caudal fin got a shallow upper lobe and barely present lower lobe , comprising about a quarter of the total length in adults . The derda denticles diamond @-@ shaped , bearing 4 – 5 faint ridges radiating from a blunt point . Tawny nurse heats yellowish , reddish , or grayish brown above and off @-@ white below , and capable of slowly changing their color to better blend with the envidament . Young sheatshave starkly white lower eyelids .