Directed by Lasse Hallström. The bird scenes were taken from the footage filmed for Eagle  in ABBA - The Movie.  NOTE: the link for ABBA - The Movie refers to the Swedish footage filmed.  There is a separate entry for the Australian footage.

This was the first ABBA PROMO to be shot on video tape as opposed to being filmed. The main reason was not only to have the desired special effect recreated effectively, but all ABBA's PROMOs were always mastered on "film" in order to have them screened internationally without technical problems caused by different countries having different video/TV systems.

The official PROMO has been released on the DVD ABBA The Definitive Collection.

Benny and Björn - they only feature for about 12 seconds in total! 

Lyrics available on the Official ABBA site

Information from ABBA Report Issue 11 (Winter 1997) - Alex Jones.
Thanks also to Carl Magnus Palm.
YouTube link c/o AbbaVEVO