Leviathan

Leviathan is the term used to classify any large non-humanoid creature whose average adult length extends beyond 100 feet (30.48 meters) and whose mass is at least 300 lbs (136 kg). While the term is more often attributed to carnivorous and hostile creatures, any creature that meets the aforementioned prerequisites is considered a leviathan.

Examples

 * Tarrasque
 * Deep Clicker
 * Sea Angel (and Colossal Sea Angel)
 * Freehome Leviathans (although extinct)