Origami: 4-in-1 Paper Cranes

These four cranes are made out of one sheet of 15x15cm (~6x6in) paper. I nearly quartered it but kept a few mm in the middle uncut. So, each crane is folded out of 7,5x7,5cm (~3x3in) paper. 
. . . I hope you understend what I want to say. . . :D