Possible Clues:

• Oft-animated monster, briefly
• Jurassic giant
• Field Museum attraction
• 'Jurassic Park' terror, for short
• Jurassic menace, briefly
• 'Jurassic Park' dinosaur, for short
• Bygone carnivore
• 'Jurassic Park' predator, for short
• Big natural history museum attraction
• Colloquialism for the large tyrannosaurus