Original air date: 26 October 2009

The timeline above shows how the programme progresses. Information about colours is the same as in starting programme.
* There is some strange inconsistency in this programme compared with zoology in general when talking about reindeer moving north in the Arctic tundra. As they are obviously moving freely these must surely be caribou and not the semi-domesticated reindeer (and continent, Eurasia vs America is not given). This part is not included in the companion book.