cover from Australia

On Monday I got a nice cover from Australia. Inside were two Australian postcards. One shows a Wombat and the other shows the Sydney Opera House.

Stamps:
Christmas Australia (from set of six) (issued 01-11-2013)
Christmas Christmas Island (from set of two) (issued 01-11-2013)
The Christmas Island was a part of the British Straits Settlement from 1901 to 1942 and from 1946 to 1958 a part of Singapore. The Christmas Island started issuing its own stamps since 1958 when it was placed under Australian control. In 1993 the Christmas Island lost its postal and philatelic independence and since then the Australian post was the postal operator of the Christmas Island. But there are still Christmas Island stamps being also valid in Australia.
Christmas Island is allowed to issue three stamp issues per year: a Chinese New Year 
stamp, a Christmas stamp and a issue on local life.
The stamp shows Santa, a frigate bird, a red crab and a turtle.

Year of the Snake (from set of two) (issued 08-01-2013)
Year of the Horse (from set of two) (issued 07-01-2014)
Both stamps are also Christmas Island stamps.

Thank You very much Krystiina!