Mock Duck was an underground band out of Vancouver with a few incarnations - the longest running lineup was Joe Mock (g), Glenn Hendrickson (d), Rick Enns (b) and Ross Barrett (sax). The name came from a spoonerism of 'fuck mock' in reference to the guitarist planning yet another rehearsal. Rick Enns was previously in Tom Northcott's band and the United Empire Loyalists.
Mock Duck's self-released 1968 Test Record is considered one of the rarest Canadian LPs ever made, as only 14 copies were originally pressed. The album is a collection of studio tracks (the single Do Re Mi had some local success) as well as live tracks recorded in 1968 including a 12 minute live improv. There's a strong element of jazz in their sound - the CD re-issue of Test Record also contains a 20 minute extended jam (Live Mock).
The single linked below is the fantastic Easterdog from 1968 - how this didn't dominate the charts at the time is a mystery:
Here is a link to a youtube video of Mock Duck playing Do Re Mi and Hurt On Me for the Cool Aid House Benefit concert.