(３９)
Then fold the head/tail to the center and raise it.
(４０)
Raise it like this picture.
Then lean the bird-base in the direction of the arrow in order to get easier to fold the other head/tail.
(４１)
Lean the bird-base like this picture.
(４２)
Then fold the other head/tail to the center and raise it.
(４３)
Raise it like this picture.
The first bottom crane is finished.
(４４)
Revert the crane back to a bird-base and spread the paper.
(４５)
Then fold the circled part.
In order to get easier to fold a crane, make a mountain-fold on the dotted line.
(４６)
Make a mountain-fold like this picture.
(４７)
Then make a star-shape.
(４８)
Make creases of a star-shape near the top crane like this picture.
Then make a bird-base and complete a crane.
(４９)
The second bottom crane is finished.
Revert the crane back to a bird-base and spread the paper.
(５０)
Then fold the circled part.
In order to get easier to fold a crane, make a mountain-fold on the dotted line.
(５１)
Make a mountain-fold like this picture.
(５２)
Then make a star-shape.
After that, make a bird-base and complete a crane in the same way as the first bottom crane.
(５３)
The third bottom crane is finished.
Revert the crane back to a bird-base and spread the paper.
(５４)
Then fold the circled part.
In order to get easier to fold a crane, make a mountain-fold on the dotted line.
(５５)
Make a mountain-fold like this picture.
(５６)
Then make a star-shape.
After that, make a bird-base and complete a crane in the same way as the second bottom crane.
(５７)
The fourth bottom crane is finished.
(don’t revert it back to a bird-base and spread the paper.)
