sauropods

Dinosaur eggs reveal nesting behavior, growth, oxygen limits, shell structure, and why even giant dinosaurs did not lay impossibly huge eggs.

Dinosaur diets are not guesswork. Fossilized teeth, stomach contents, coprolites, bone bite marks, and isotope chemistry all leave chemical and physical signatures that paleontologists read like a menu. From the grinding dental batteries of hadrosaurs to the bone-cracking bite of T. rex, from gastroliths in sauropod ribcages to grass seeds inside a titanosaur coprolite, the fossil record has preserved an unexpectedly detailed picture of who ate what — and how plants and dinosaurs co-evolved over 165 million years.

The largest animals to have ever walked on land were not the predators — they were the plant-eaters. Patagotitan mayorum, a titanosaur from Argentina, weighed an estimated 57–70 tonnes and stretched roughly 37 meters from snout to tail. Getting to that scale required solutions to engineering problems that no other land animal has ever faced or solved.