(２２)
After putting the flap back, make mountain-folds on the dotted lines.
(２３)
Make mountain-folds like this picture.
(２４)
On the opposite side, make mountain-folds on the dotted lines.
(２５)
Make mountain-folds like this picture.
(２６)
Then make a bird-base.
Move the rectangular part in the direction of the arrow while pushing the part which is shown by the arrow.
(２７)
This picture is halfway through.
(２８)
After moving the rectangular part, it looks like this picture.
(２９)
Then complete a bird-base.
(３０)
The bird-base is finished.
(３１)
Fold the head/tail to the center and raise it.
(３２)
Raise it like this picture.
Then revert it back to a bird-base.
(３３)
Revert it back to a bird-base like this picture.
(３４)
Then fold the other head/tail to the center.
(３５)
After folding the head/tail, raise it.
(３６)
Raise it like this picture.
Then revert it back to a bird-base.
(３７)
Revert it back to a bird-base like this picture.
Then spread the paper.
(３８)
Then fold the square which has been circled.
In order to get easier to fold a crane, make mountain-folds on the dotted lines.
(３９)
Make mountain-folds like this picture.
Then turn the paper over as it is.
(４０)
After turning the paper over, fold four corners to the center point in the circled square.
(４１)
Fold four corners to the center point like this picture.
Then turn the paper over as it is.
(４２)
After turning the paper over, repeat the 5th step to the 37th step to make a crane once.
(４３)
The crane is finished.
Then revert it back to a bird-base and spread the paper.
