Why was the film entitled silence of the lambs?

Answer 1

The young FBI trainee, Clarice tells Hannibal a childhood memory about the farm she grew up and where once she tried to save a lamb from slaughter. She coluld not manage and since then in her dreams she hears the lambs crying. Hannibal asks her: "And you think if you save poor Catherine, you could make them stop, don't you? You think if Catherine lives, you won't wake up in the dark ever again to that awful screaming of the lambs."