Original air date: 30 October 2014
Above is a timeline of how the programme progresses
Selected sequences
The life of the arctic fox
It is a hard life for the arctic fox to hunt something it doesn’t see
It may be hard to dive for a lemming when you don’t know the depth of the snow ..
It may be soft (left) and you get buried in it, or shallow and the landing will be painful as your body buckles underneath the force of landing
The first known use of tool-use among invertebrates ?
An octopus holding two shells that he is gonna use as his home, claimed to be first known tool-use among invertebrates, however, another example predates this by several decades: a wasp using a pebble to block outsiders to get its young – in Trials of Life.