Original air date: 9 November 2011
A graphical presentation of what happens in the episode

A more detailed look at the contents is below

Note what happens at the end of the battle between the wolves and the musk oxen (21’30). The wolves have isolated a single young calf when the adults decide to strike back and the wolves are forced to retreat. Compare it with a similar sequence in the winter programme.
Selected material
A musk oxen herd strikes back

The attempted hunt starts (left, 20’14) with the wolves (only two of them) attacking the herd to pick the weakest member to attack. They find a calf that they manage to isolate (20’20).

The herd strike back (left, 20’40), shown from far away to capture the whole group attacking the two wolves to save the calf (right, 20’59).

This leads to an impregnable fort with the calf in the middle, quite safe