For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much: The wheel, New York, wars and on. Whilst all the dolphins had ever done was muck about in the water having a good time.
21 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 3 sitcom.
You can hear this line at 00:26:25.860 in the Blu-ray version of the TV Series.
Quote context
[...]
- Excuse me, what is your name, by the way?
- My name? My name is Slartibartfast.
- It is an important and popular fact that things are not always what they seem.
- So they eventually gave up and left the Earth by their own means, shortly before the Vogans arrived.
- In fact, there was only one species on the planet more intelligent than dolphins.
[...]