# The Crab Nebula

The Crab Nebula Contrasts and compares the effect of two kinds of dam-building -- that done by beavers, and that done by human engineers. Points out how man is damaging the ecological balance of nature whereas the beaver is not.

- Kind: Educational
- Year: 1972
- Runtime: 59 min
- By: British Broadcasting Corporation. Television Service, Time-Life Films
- Genres: Education, Space, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/thecrabnebulareel1)
- Licence or status: none stated by the archive
- Who can watch: Kids profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/thecrabnebulareel1?play=1)