Hedgehog by Imai Yudai

Diagrams in New Generation of Supreme Origami by Makoto Yamaguchi
Diagrams in Origami Tanteidan Magazine 172
Diagrams in Strongest Origami: From Ultra Monsters to Heartwarming Animals by Imai Yudai
Folded from a square of Kraft paper

Hedgehog by John Richardson

Diagrams in BOS Magazine 75
Diagrams in Dieci Bellissimi Origami - 10 Beautiful Origami - QQM 1
Diagrams in Origami Paperfolding for Fun by Eric Kenneway
Folded from a rectangle of wrapping paper

Hedgehog by Mark Bolitho

Diagrams in BOS Magazine 176
Diagrams in Der Falter 19
Diagrams in More Origami Projects by Mark Bolitho
Diagrams in More Origami Projects - 2nd Edition by Mark Bolitho
Diagrams in Origami Deutschland 2015
Diagrams in Origami USA Convention 1996
Folded from a square of patterned origami paper

Hedgehog by Paul Jackson

Diagrams in Origami Zoo by Paul Jackson and Miri Golan
Folded from a square of textured origami paper