Collect the indicated number of Dragon Eggs to unlock the corresponding option in the "Secrets" menu.

Concept art: 1
Character Viewer: At least 11
Ember Model: At least 21
Flame Model: At least 31
Sgt. Byrd Mini-games: At least 41
Spyro Turret Mini-games: At least 51
Sparx Shooter Mini-games: At least 61
Blink Mini-Games: At least 71