Next, fold the WHOLE top triangle down.

The 'petal fold' in progress.

A clearer shot of the petal fold.

The petal fold complete, laid down flat.

...and do the same petal fold steps on the other side.

Again, fold the top triangle down...

...finish the petal fold. This is called the 'bird base'.

Fold in the top layer of each side, to meet the middle.

Then flip the whole thing over and fold in the other sides the same way.

This shows the pre-fold needed before doing the 'reverse fold' that forms the neck and tail.

This shows how you open up the sides. Then turn the point 'inside out' to make the reverse fold.

Fold down one wing...

...then flip it over and fold down the other.