Some of the tundra animal adaptations are that the animals of the Tundra can live in the freezing weather, like the Snowy Owl.  The snow shoe hare has over sized feet that help it equalize its weight so it won't sink into the snow.  The musk oxen have big and shaggy coats that keep them warm throughout the winter.  Some of the Tundra animals slow down their body process and hibernate through the winter.
 
 

                                          click to hear a Snowy Owl