From the Main Menu go to Options and then go to Unlock Codes.

Code	Effect
03275	Suchomimus
04629	Neo Carnotaurus
09182	Cassosaurus
10927	Neo Velociraptor
13579	Neo Ankylosaurus
16948	Naxocertops
18275	Neo Triceratops
18963	Wuerhosaurus
20135	Neo Ceratosaur
23071	Neo Miragaia
23587	Gorgoraptor
25378	Neo Styracosaurus
27139	Hilierosaurus
28169	New set of stripes
31946	Neo Einiosaurus
35274	Allosaurus
37452	Neo Carcharodon
43782	Neo Dilophosaurus
46135	Chasmosaurus
51274	Troodon
62584	New set of stripes
69281	Gastonia
73096	Neo T-Rex
74312	Neo Juravenator
75139	Neo Baryonyx
81726	Neo Dacentrurus
84570	Neo Stegosaurus
86420	Neo Scolosaurus
90817	Neo Edmontonia
93245	Neo Oviraptor