Night of the Seagulls (1975)
Night of the Seagulls (La Noche de las gaviotas; UK video title: Don't Go Out at Night) (1975) is a Spanish horror film written and directed by Amando de Ossorio. This film also inspired a song by the New York City Oi band The Templars, and a song by UK doom metal band Cathedral.
More at Wikipedia.