Styracosaurus by Fumiaki Kawahata

 From Fumiaki Kawahata's Dinosaur Origami.

Fish by Beth Johnson

From Makoto Yamaguchi's The Elegance of Origami.

Reedcutter locust (yoshikiri?) by Yoshihide Momotani

 From Yoshihide Momotani's Origami Insects.

Bulldog bookmark by Christine Edison

 From the (apparently now defunct) blog "Flotsam and Origami Jetsam," entry of 15 August 2010 at https://cedison.wordpress.com/2010/08/15/bulldog-bookmark-instructions/

(This entry was made in State College, PA, on the eve of the annual AAUW book sale, hence the choice of subject matter, although I suppose it could equally well have been to commemorate a dog show.)

Otomo No Kuronushi (traditional; from the Kan No Mado)

 From Robert Harbin's New Adventures in Origami. (Really bad image of) pattern from the Kan No Mado taken from David Mitchell's "Public Paperfolding History Project" on his "Origami Heaven" website at http://www.origamiheaven.com/historyindex.htm

Otter by Makoto Yamaguchi

 From Makoto Yamaguchi's The Elegance of Origami.

Penguin bookmark by Jo Nakashima

 From Jo Nakashima's YouTube channel at https://www.youtube.com/watch?v=xdKdRxYBx1g&ab_channel=OrigamiwithJoNakashima