Common loon by Artur Biernacki

Diagrams in Bogota Origami Convention 2015
Diagrams in Korea Origami Convention 2015
Diagrams in Polish Your Origami by Artur Biernacki
Folded from a square of double-sided Unryu paper

Loon by John Szinger

Diagrams in Origami Animal Sculpture by John Szinger
Diagrams in Origami USA Convention 2009
Diagrams in Zing Origami by John Szinger
Folded from a square of origami paper

Common loon by Joseph Wu

Folded from a square of double-sided Unryu paper