Original air date: 12 September 2001
Wikipedia uses the title “Introduction”, but the DVD box set uses the above title.
A more thorough text version of the timeline
Selected material
Dolphins using bubble netting (17’30-17’50)
Common dolphins using bubble netting. By many scientists it is regarded as tool use because the environment is used to create a barrier the prey, sardines in this case, can’t pass. In the images above the sardines are dark blue while the bubbles are light blue.