How a team of men and dogs relayed an antitoxin across 674 miles of Alaskan wilderness. (R)
3/3 The search reaches its climax as Steve Backshall has a very close encounter. (R)
Countryfile is in Dorset. Matt Baker explores a woodland architecture school. (R)
8/26 The series on the nature and wildlife of Britain and Ireland looks at the windhover. (R)
4/6 The mountain team has to call in the helicopter to reach their remotest ski tow.
BBC One Scotland, Scotland HD only
1/3 How the work of Carl Linnaeus, Phillip Miller and John Ray created the science of botany. (R)