Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a suspense story with some wild camera work and a great score by Henry Mancini that is directed by Stanley Donen who also directed Singin' in the Rain and the similar suspense story Charade.
Sophia Loren and Gregory Peck are chased by a man through the Zoological Gardesn in London. There are lots of interesting shots them running by animals in barred cages (zoos in those days were designed to better the experience of the patrons not the comfort of the animals) and then we see them filmed through various aquariums, and running in front of a large tank holding some sea turtles. At one point in the chase we see five brief cuts to close-up shots of the heads of two snakes and three lizards. As each animal sticks out its tongue, the music puntuates the tongue with a quick blast of horns.
The snakes are pythons, the lizards are monitor lizards and a large skink.
This is absolutely the best use of reptile tongues synced to a movie soundtrack that I've seen. (It's also the only one I've seen.)
You can watch a brief video clip here.