Nasty production detail concerning the rats used in the film
I just saw an interview with a former biologist (now a writer), Maarten t Hart, on dutch television. T Hart was asked was asked by Herzog to convince the Delft (the dutch town where part of the film was shot) municipality that it wouldn't be dangerous to release an amount of 10.000 rats in the city... T Hart didn't succeed in convincing the municipality so the rat scenes where shot in the town of Schiedam.
Now... the rats used in the film came from Hungary and had to be transported to holland by truck, on a three day trip in which the animals didn't receive any food or water. Naturally, a lot of the animals didn't survive (the ones that did resorted to cannibalism). Once arrived, Herzog wanted the rats to be painted black (because they were all white lab rats), this was done via a process in which the rats where submerged in boiling hot water, of course killing a lot of them...
I still think Nosferatu the Vampyre is a great film, but I found this detail pretty shocking..