How did they get so big?
Long necks let them eat lots of plants without moving. Hollow bones kept them light. Fast-growing babies reached huge sizes within 30 years.
How heavy?
Argentinosaurus may have weighed 70+ tons - heavier than 10 elephants.
Species Basics / Ages 5+ / 4 min
The Biggest Dinosaurs
By DinoFlex Editorial Team
Species explainersSauropodsDinosaur biology
Long-necked sauropods are the largest land animals that ever lived. Some grew more than 30 meters long.
Fast facts
- Patagotitan is one of the biggest known
- Some sauropod necks were 15 meters long
- Babies grew up to 40 kilograms a day
- Their skin was scaly, not feathered
Watch next
Videos matched to this lesson, with a quick discussion question for families.
Andy's Amazing AdventuresVideoAges 5+
The Biggest Dinosaurs! | Andy's Prehistoric Adventures | Andy's Amazing Adventures
A kid-friendly prehistoric adventure about enormous dinosaurs and what size can teach us.
Dino educationBiggest dinosaurs
Ask: why did some dinosaurs get so large?
CuratedYouTube
PBS KIDS27 minAges 5+
Dinosaur Train: I'm a T. Rex! / Ned the Quadruped
A full episode pairing T. rex identity with the differences between two-legged and four-legged dinosaurs.
Dino videosT. rex
Ask: why do some dinosaurs walk on two legs and others on four?
CuratedYouTube
Keep reading
More dinosaur guides connected by topic, category, or editorial picks.
Species Basics / 5 min
What Is a Dinosaur?
Not every prehistoric reptile was a dinosaur. Here's how scientists tell the difference.
Geology & Time / 6 min
The Mesozoic Era: When Dinosaurs Lived
Three periods, 165 million years, and one giant change in life on Earth.
Behavior & Biology / 5 min
Feathered Dinosaurs
Most dinosaurs had feathers, fuzz or quills. Here's what science says now.