Linked cranes (Pinwheel pattern) by Rokoan

Made from a sheet of paper with four slits in it. Wings are all connected, beaks are all connected. The pattern is called "kaza guruma," (pinwheel, windmill). Not to be confused with the much easier variation where only the beaks are connected; that one is called "sazanami" and there are multiple websites showing how to make it.

The photo shows a second attempt. The first attempt tore in four different places before I gave up on it.

The following quote is from the website http://www.orizuru49.com/en/ :

Renzuru (literally meaning “consecutive cranes”) is a series of multiple conjoined cranes folded from a single sheet of paper with strategic cuts. The first appearance of renzuru is in a book published in 1797, titled Hiden Senbazuru Orikata (the secret methods of making a thousand conjoined cranes). 

From Otsuka Yurami's The Thousand Cranes of Kuwana City.