The USS Seagull (NCC-4647) was a Mockingbird-class scout that saw service with the Federation Starfleet during the 23rd century. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era During a five-year mission from 2294 to 2299, the Seagul discovered five uninhabited class M planets. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era)