U.F.O OR SEAGULL?

GCHQ slide pictures -3 show the following-a black and white picture of u.f.o over Redbud,Illlionis april 23 1950,a video mexico  taken by Aarturo robles gil,and picture shown  taken at Blackhead,Tenarren,near St.Austell ,cornwall.As usual all these were dismissed as ballons ,out of focus seagull having a poo.etc.This is revealled by  Edward Snowdon -The Art Of Decption of Online Covert Operations.