Senbazuru (kissing cranes)
Model by Unknown / traditional.
Renzuru model of four cranes joined by head.
This model can be folded with a thin (crane) or thick (flapping bird) neck and tail. The thin version is more difficult.
Paper & size
When folded from a 17.5cm square, this model ends up 15cm wide (tail to tail) and about 4cm in height.