About Dinosaur Facts
Dinosaur science changes as new fossils, better dating, CT scans, microscopic bone studies, and improved evolutionary methods add evidence. Some facts that seemed certain decades ago have been revised, which is exactly how science is supposed to work.
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Birds Are Dinosaurs
Modern birds are living members of the dinosaur family tree.
Learn MoreFeathers Were Widespread
Many dinosaurs were partly or fully feathered.
Learn MoreDinosaurs Lived for an Enormous Span of Time
The first dinosaurs and T. rex were separated by well over 150 million years.
Learn MoreDinosaurs Came in Many Sizes
Not every dinosaur was huge.
Learn MoreMany Dinosaurs Grew Quickly
Microscopic bone structure records patterns of growth.
Learn MoreTracks Record Behavior
Footprints can preserve moments that skeletons cannot.
Learn MoreSome Dinosaur Colors Can Be Studied
Exceptionally preserved feathers may retain microscopic pigment structures.
Learn MoreDinosaur Names Can Change
Scientific names are hypotheses about identity and relationships.
Learn MoreMost Dinosaurs Never Fossilized
The fossil record is only a tiny sample of ancient life.
Learn MoreMovies Are Not Textbooks
Popular dinosaur designs often lag behind science.
Learn MoreBirds Are Dinosaurs
Birds evolved within theropod dinosaurs. Many traits once thought unique to birds, including feathers, wishbones, hollow bones, nesting behavior, and air-filled skeletons, are now known from non-avian dinosaurs as well.
Feathers Were Widespread
Not all dinosaurs had feathers, and skin coverings varied by group. Fossils show feathers or feather-like structures in numerous theropods and some plant-eating dinosaurs.
Dinosaurs Lived for an Enormous Span of Time
The dinosaur era was much longer than the time since the extinction. This means a Late Triassic dinosaur lived far earlier relative to T. rex than T. rex lived relative to us.
Dinosaurs Came in Many Sizes
Some non-avian dinosaurs were smaller than a modern chicken, while giant sauropods reached lengths above 30 meters. Body size varied enormously across different lineages.
Many Dinosaurs Grew Quickly
Paleontologists can cut extremely thin fossil bone samples and study growth lines, blood-vessel spaces, and tissue organization. Large dinosaurs often reached adult size much faster than similarly sized reptiles would today.
Tracks Record Behavior
Trackways reveal direction, stride, foot shape, and sometimes group movement. A single track does not always identify an exact species, but it can still provide valuable information.
Some Dinosaur Colors Can Be Studied
Melanosomes are tiny structures associated with pigments. Their shapes and arrangements in fossil feathers can sometimes be compared with living birds to estimate patterns such as black, reddish, or iridescent coloration.
Dinosaur Names Can Change
New fossils can show that two named species were actually the same animal, or that one group needs to be split. Scientists follow naming rules, but classifications continue to change as evidence improves.
Most Dinosaurs Never Fossilized
Bodies usually decay, are scavenged, or weather away. Fossilization requires special circumstances. Entire dinosaur species may have existed without leaving any fossils we have found.
Movies Are Not Textbooks
Film creatures may be oversized, missing feathers, placed with species from the wrong time period, or given speculative behavior. Entertainment can inspire interest, but museum research and scientific papers are better sources for accuracy.