Getting 3 stars is impossible if you use more than two bird.
The pigs in the wood blocks can be tricky.
Launch Terence north, aiming at the junction of the lower hallow ice block with a pig and the wooden block above. Terence should be able to slice through the first tower, bounce on the bottom blue crystals and knock the east tower over the steam geyser. You get 30,000 points for the rest birds.