Dinosaurs

1. British dinosaur directory entries by period and diet

The British entries in this directory sample are concentrated in the Early Cretaceous and Jurassic, with plant-eaters and meat-eaters represented in several intervals. This is a count of named directory entries associated with Britain, rather than a count of fossil specimens or individual animals. Each entry contributes once, according to the broad period and diet assigned in the source dataset. Green represents herbivores, red carnivores and amber omnivores.

The pattern depends strongly on which rocks are exposed, how intensively they have been searched and how the resulting fossils have been classified. It cannot establish that dinosaur diversity rose steadily through time. An empty interval means there are no matching entries in this particular selection, not that Britain contained no dinosaurs then. Megalosaurus belongs in the Middle Jurassic, correcting a common confusion with later Jurassic predators. The full table identifies the British entries alongside dinosaurs from elsewhere, allowing readers to explore the animals behind the grouped totals without treating the directory as an exhaustive census.

Source: World Dinosaur Dataset v2 (2024); 22 UK-associated entries. Period labels follow the directory snapshot; these are not specimen counts.

2. Locations in a selected 20-entry Tyrannosaurus compilation

Montana accounts for twelve of the twenty entries in the compilation retained from the source page, with South Dakota contributing four and Wyoming two. Saskatchewan and Alberta contribute one each. The doughnut makes this selected distribution easy to see, while its title identifies the small denominator. These proportions describe the supplied compilation; they are not a claim that sixty per cent of every Tyrannosaurus fossil ever discovered came from Montana.

The original list does not provide a complete specimen roster or a selection date, which limits how far the figures can be generalised. Fossil discoveries are influenced by suitable rock exposures, collection effort, access and the survival of remains. A later, broader study may therefore produce a different geographic balance without contradicting this small selection. The chart preserves the page’s original subject while making its evidential limits explicit. Tyrannosaurus is especially associated with western North America, but modern state and provincial boundaries should not be confused with the boundaries of its ancient ecosystems.

Source: source-page compilation. Counts total 20; specimen roster and compilation date were not supplied. Not a global or current inventory.

3. Estimated lengths of selected large theropods

Spinosaurus has the longest estimate among the selected theropods, followed by Carcharodontosaurus and Giganotosaurus. Several familiar predators cluster around twelve metres, illustrating how little separates some headline size rankings. Those differences should be read cautiously: reconstructed length depends on the fossil material available, the individual represented and the assumptions used to complete missing parts. A longer animal was not necessarily heavier or more powerful.

The title uses “theropods” because this group includes animals with different diets. Deinocheirus, shown here at the directory’s ten-metre estimate, is classified as omnivorous rather than simply another giant carnivore. The comparison uses metres consistently and identifies one source dataset instead of presenting a definitive world top ten. New discoveries and revised reconstructions can change individual estimates. Spinosaurus is also a useful reminder that body shape matters: its distinctive proportions make direct comparisons with a heavily built Tyrannosaurus more complicated than a single bar suggests. The photograph below shows one museum interpretation of its skeleton.

Source: World Dinosaur Dataset v2 and NHM Spinosaurus profile. Selected estimated lengths; Deinocheirus is omnivorous.

4. Favourite dinosaurs among US adults, 2024

Tyrannosaurus rex leads the six named choices shown from this American survey, with a much larger share than any runner-up. Velociraptor and Brontosaurus share second place among the displayed options, followed by Triceratops. These results describe modern preferences rather than scientific importance, fossil abundance or the relative success of dinosaurs in their own environments. A creature can be highly recognisable even when its fossil record is limited or its popular depiction is inaccurate.

The percentages use all surveyed US adult citizens as their base. They therefore include people who had no favourite, rather than describing only committed dinosaur enthusiasts. The six bars do not add to one hundred because other answers and respondents without a favourite are not plotted. Pterodactyl is retained as the survey’s familiar wording, but explicitly identified as a pterosaur rather than a dinosaur. Keeping that distinction visible allows the page to report public perceptions faithfully while preserving the scientific difference between these groups of prehistoric animals.

Source: YouGov, 26 November–3 December 2024. 1,122 US adult citizens; six leading named responses. Pterosaurs are not dinosaurs.

5. Favourite dinosaurs among British dinosaur fans, 2024

Tyrannosaurus rex is also the leading favourite in the British survey, while Stegosaurus, Triceratops and Diplodocus form the next group of popular choices. Each has a distinctive outline that is familiar from museum displays, books and films. Diplodocus is particularly relevant to British museum history through the cast known as Dippy, making it a fitting subject for the photograph immediately below.

The respondent base is crucial. This question was asked only of people who said they liked or loved dinosaurs, not of every adult in Great Britain. Its thirty per cent Tyrannosaurus result therefore cannot be directly compared with the nineteen per cent American figure as a measure of stronger national enthusiasm. The surveys asked different populations and were conducted at different times. The five bars show the leading named responses rather than the complete answer distribution. Reading them as a ranking within this specific group preserves their value without turning a difference in survey design into an unsupported cultural conclusion.

Source: YouGov, 8–9 October 2024. Favourite question: 1,009 respondents who liked or loved dinosaurs; parent sample 2,139 adults in Great Britain.

6. The three periods of the Mesozoic

The Mesozoic is divided into the Triassic, Jurassic and Cretaceous periods, each spanning tens of millions of years. The horizontal ranges show their approximate boundaries on a shared scale measured in millions of years before the present. Older dates are farther to the right. This presentation emphasises the amount of time involved, rather than treating the three period names as equally spaced labels in a list.

The Cretaceous is the longest of the three intervals shown. Its end, around sixty-six million years ago, marks the extinction of non-avian dinosaurs, while birds continue the dinosaur lineage today. Dinosaur history does not fill every part of the Triassic, and animals from different periods should not automatically be imagined living together. The period boundaries are geological reference points, not dates at which every ecosystem changed at once. Their numerical ages can be refined as dating improves. This broad timeline supplies context for the directory’s period labels without implying that those older profile estimates have matching precision.

Source: International Commission on Stratigraphy. Approximate boundaries: 251.902, 201.4, 143.1 and 66 million years ago. Older dates lie to the right.

7. Estimated length versus weight in selected dinosaurs

Longer dinosaurs tend to occupy the heavier part of this selected comparison, but the relationship is far from a simple conversion. Diplodocus combines considerable length with a relatively modest weight estimate compared with the giant titanosaurs. A long neck and tail can add substantially to length without adding the same mass as a deep, robust torso. Length and weight therefore describe different aspects of dinosaur size.

Each point represents the paired estimates in the source directory, with metres on the horizontal axis and tonnes on the vertical axis. These are reconstructed values rather than measurements of living animals, and published estimates can vary considerably. The sample deliberately includes contrasting body plans, from sauropods to horned and armoured dinosaurs and large theropods. It is not a statistically representative sample of all dinosaurs, so no fitted relationship is presented as a general biological law. The plot is most useful for exploring contrasts between named animals and seeing why a single “biggest dinosaur” title can be ambiguous.

Source: World Dinosaur Dataset v2. Selected paired estimates; 1 tonne = 1,000 kg. Hover or tap points for dinosaur names.

8. Diet among the dinosaurs in this selection

Plant-eaters form the largest dietary group within the selection used for this page’s dinosaur table. Meat-eaters contribute another substantial share, while omnivores form a smaller category. The green, red and amber segments use the same meanings as the British period comparison, making it easier to follow a dietary category across different views. Each named directory entry counts once, regardless of its body size or the number of fossils known.

These proportions describe an editorial selection of dinosaur entries, not the balance of animals in a prehistoric ecosystem. A single herbivorous species might once have been extremely abundant, but a directory count gives it the same weight as a rare species. Dietary assignments can also be revised when new anatomical or fossil evidence becomes available. The chart is therefore a compact guide to the animals included on this page rather than an estimate of global dinosaur populations. Triceratops, pictured below, provides a recognisable example of the plant-eating group and its distinctive feeding anatomy.

Calculated from the 73 selected entries in World Dinosaur Dataset v2. Entry shares, not population shares.

9. Dinosaur body-plan groups across three periods

The selected directory entries show different mixtures of body plans across the Triassic, Jurassic and Cretaceous. Sauropods and their early relatives form one series, theropods another, while horned, armoured and other predominantly plant-eating groups are combined in the third. These broad categories keep the comparison readable while showing that the familiar dinosaur world contained several very different forms of animal.

The totals reflect the entries chosen for this page, including all twenty-two British entries in the source snapshot and a wider selection of familiar dinosaurs. They should not be interpreted as a complete diversity curve or a count of animals alive at any particular moment. The periods differ in duration, fossil preservation is uneven and the selection itself favours recognisable examples. Theropods also include omnivores and herbivores, so the purple group here is a body-plan category rather than a repeat of the diet chart. The table’s more detailed group labels allow individual entries to be explored without forcing every distinction into the chart.

Source: selected entries from World Dinosaur Dataset v2. Broad groups follow the directory; counts reflect selection and preservation, not global abundance.

10. Estimated lengths of ten large plant-eaters in the selection

The largest plant-eaters in this selection extend well beyond the lengths of the theropods compared earlier. Sauropods dominate the ranking because their long necks, substantial bodies and extended tails produced extraordinary overall dimensions. Patagotitan and Argentinosaurus illustrate the scale reached by titanosaurs, while other familiar sauropods show that very long bodies evolved in several lineages and regions.

The figures are approximate directory estimates, not measurements of complete animals standing side by side. Some dinosaurs are known from much more complete material than others, and the largest individual of a genus may differ from a typical reconstructed example. Length alone also cannot decide which animal was heaviest, as the scatter plot demonstrates. This chart therefore describes ten large plant-eaters within the page’s selection rather than a definitive global record list. Read together with the carnivore comparison, it shows that spectacular dinosaur size was not confined to predators and that body proportions are essential to understanding what a size estimate means.

Source: World Dinosaur Dataset v2. Ten longest herbivorous entries in this page’s selection; approximate estimates, not a definitive world ranking.

11. Dinosaur reference table

Explore 73 dinosaurs, with one row per directory entry. Scroll vertically and sideways to compare body type, diet, period, size and fossil locations. Values follow the 2024 source snapshot and are approximate; a dash means no estimate was provided. Period labels and broad age ranges reflect that directory and may not align precisely with revised geological boundaries. Fossil locations are modern countries, not complete ancient ranges.