The Royal Tern is a large, orange-billed tern which is found only along ocean beaches.
Both a non-breeding adult and a juvenile have a white forehead and a narrow, shaggy band around the back of the head. 
A breeding adult has a complete black cap.
A juvenile Royal Tern is similar to a non-breeding adult, but its bill is smaller and pale yellow instead of orange.

1st & 2nd photo: Alfred A. McKethan Pine Island Park, Spring Hill, Florida, USA, 25 March 2022
3rd & 4th photo: Fort de Soto County Park, Tierra Verde, Florida, USA, 31 March 2022
5th photo: Naples Pier, Naples, Florida, USA, 21 November 2012