Step 1: Preparation
Template (this is formatted for 8.5" by 11" but you can still print it on A4 paper. You'll just need to trim the edges when you're done with the card). Click on the pdf below and save it to your disk.
Cutting board (a real one works best but you can substitute it with corrugated cardboard)
An exacto knife (Small scissors with a pointed sharp end could work but you might not be able to get the best detail -- but with scissors you won't need the cutting board either)
2 sheets of cardboard stock of contrasting color (you can use regular paper but the result won't look as good. Construction paper can work too but it usually doesn't come in letter size so you'll need to trim it first).
A ball point pen for scoring
Step 2: Print and cut
Cut along solid lines.
Please note: if your printer won't work with light card stock (mine won't...) you can print on regular paper. Tape your blank cardboard paper to your cutting board with drafting tape, then tape your template over it. You will then cut and score through both sheets at once, and you can pop out the shapes in either direction.
If you print directly on the card stock your bird will fly to the right, rather than to the left as it does in my pictures.