Here are the stats for a raven:
Raven - Pathfinder_OGC
If I were to simulate a canary, I'd take those stats, and drop: low light vision, Dex by 4, the feats skill focus (perception) and weapon finesse, and the skill perception.
I'd add: 7 to charisma (giving a bonus of +2 at 14 Cha), and the feats skill focus (perform - singing) and , skill focus (diplomacy) and add the skill perform.
While a canary is a fun and viable scout, I don't think it's necessarily a primary/awesome scout.
I do think it could be more of a "spy"...performing, hanging out, and, using druid or ranger spells, communicating knowledge to its owner.
I'd use a canary to perform and ingratiate itself to others, and also to give an "aid another" to diplomacy checks.
As a dm, I'd rule that a successful perform check would be a +2 to the diplomacy check. As a total, that'd be +2 from charisma, +2 on a successful perform check, and the +3 bonus from skill focus (diplomacy).
So, should it sing well, that's +7 to an aid another on diplomacy and a +5 without singing well (a roll of 3 or 5 on a d20).
EDIT: Upon reading the above post...good idea shrinking it a size category.