- Cons ❌
- Incomplete Skeleton (1)
- Incomplete Understanding (1)
- Limited Behavior Data (1)
- Limited Complete Skeletons (1)
- Behavior Debates (1)
- Complex Anatomy (1)
- Difficulty Moving (1)
- Incomplete Fossils (1)
- Incomplete Remains (1)
- Limited Arm Functionality (1)
- Limited Brain Size (1)
- Heavy Weight (1)
- High Food Requirements (1)
- High Maintenance Diet (1)
- Limited Adult Specimen Data (1)
- Common Appearance (1)
- Complex Evolution (1)
- Complex Flight Mechanics (1)
- Fragile Sail Structure (1)
- Limited Defense (6)
- Limited Complete Specimens (1)
- Age Controversy (1)
- Fragile Bones (4)
- Function Of Crest Debated (1)
- Incomplete Fossil Record (1)
- Outdated Early Interpretations (1)
- Relatively Small Arms (1)
- Slow Movement (3)
- Small Size Limits Predatory Capabilities (1)
- Very Small Size (1)
- Limited Diet Information (1)
- Limited Uniqueness (1)
- Limited Vision (1)
- Misunderstood Role (1)
- Limited Prey Variety (1)
- Limited Size (1)
- Limited Speed (1)
- Limited Terrestrial Mobility (1)
- Purpose Of Spines Debated (1)
- Regional Distribution (1)
- Restricted Head Movement (1)
- Size Limitations (2)
- Limited Maneuverability (1)
- Small Size Limits Study Scope (1)
- Slower Than Smaller Raptors (1)
- Limited Fossil Sites (1)
- Limited Ground Mobility (1)
- Small Size (5)
- Smaller Than T-Rex (1)
- Limited Defensive Capabilities (2)
- Vulnerable To Predators (5)
- Discovery Location 🌍
- Kem Kem Beds Morocco (1)
- Belgium (1)
- Argentina (3)
- Bavaria Germany (1)
- Colorado USA (2)
- Dorset England (1)
- Gobi Desert Mongolia (2)
- Hell Creek Formation Montana (2)
- Kansas USA (1)
- Alberta Canada (4)
- Mongolia (3)
- Liaoning China (1)
- Cerro Fortaleza Formation Argentina (1)
- Egypt (1)
- Germany Europe (1)
- Arizona USA (1)
- Canada North America (1)
- Como Bluff Wyoming (1)
- Germany France (1)
- Khok Kruat Formation Thailand (1)
- La Amarga Formation Argentina (1)
- Niger Africa (1)
- Oxfordshire England (2)
- Patagonia Argentina (1)
- Sichuan China (1)
- Utah USA (2)
- Montana USA (4)
- New Mexico USA (1)
- South Dakota USA (2)
- Tanzania Africa (1)
- Texas USA (1)
- Mongolia Asia (1)
- South Africa (1)
- Oklahoma USA (1)
- North America (1)
- Morrison Formation Wyoming (1)
- Distinguishing Features 🦄
- Agile Build (2)
- Bipedal (1)
- Bristles (1)
- Club Tail (1)
- Bird-Like Features (2)
- Beaked Jaw (1)
- Armored Body (1)
- Back Plates (1)
- Column-Like Legs (1)
- Beak-Like Mouth (1)
- Large Skull (1)
- Neural Crests (1)
- Plates Along Back (1)
- Different-Sized Teeth (1)
- Dual Head Crests (1)
- Duck Bill (2)
- Head Crest (2)
- Large Size (1)
- Giant Killing Claw (1)
- Massive Claws (1)
- Massive Wingspan (1)
- Nostrils On Head (1)
- Multiple Spikes (1)
- Powerful Legs (1)
- Extremely Long Neck (1)
- Flexible Skull (1)
- Four Wings (1)
- Iridescent Feathers (1)
- Long Neck (11)
- Robust Limbs (1)
- Duck-Like Bill (3)
- Hollow Head Crest (3)
- Horned Skull (1)
- Long Nose Horn (1)
- Massive Size (2)
- Sharp Claws (2)
- Thumb Spikes (1)
- Spiky Head (1)
- Stiff Tail (1)
- Tiny Arms (2)
- Short Snout (1)
- Sickle Claws (1)
- Small Head (2)
- Spikes (2)
- Slender Build (1)
- Toothless Beak (4)
- Wing Membranes (1)
- Spiked Tail (1)