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Latest revision as of 06:19, 3 January 2026

Welcome to the explain xkcd wiki!
We have an explanation for all 3213 xkcd comics, and only 61 (1.9%) are incomplete. Help us finish them!

 Go to this explanation

Latest comic[edit]

Dinosaurs And Non-Dinosaurs
Staplers are actually in Pseudosuchia, making them more closely related to crocodiles than to dinosaurs.
Title text: Staplers are actually in Pseudosuchia, making them more closely related to crocodiles than to dinosaurs.

Explanation[edit]

Ambox warning blue construction.png This is incomplete:
This page was created by a CHROME DINOSAUR; however, it is definitely not. Don't remove this notice too soon. If you can fix this issue, edit the page!

This comic explores the seeming paradox that certain extinct prehistoric species which are popularly thought of as being "dinosaurs" are, from a strict taxonomic viewpoint, not. It also takes into account the fact that all bird species are descended from dinosaurs and thus - again, from a strict taxonomic viewpoint - are themselves dinosaurs as well (see 1211: Birds and Dinosaurs). To illustrate this, Randall provides silhouettes of dinosaurs, of entities that are widely thought of as dinosaurs but are not, of entities that are not widely thought of as dinosaurs but are (i.e. birds), and, lastly, of entities that are neither dinosaurs nor thought of as dinosaurs (which is funny[citation needed] because it's so all-encompassing as to be practically meaningless, just like it would be if you replaced the word "dinosaurs" by any other plural noun, or adjective).

Creatures that seem like dinosaurs and are dinosaurs[edit]

  • Stegosaurus
  • Triceratops
  • Tyrannosaurus Rex, whose name literally translates to Tyrant-Lizard King, was a Late Cretaceous dinosaur, living during the Maastrichtian Age at the very end of the period. It was a contemporary of Triceratops and Mosasaurs, also listed in this comic. T-Rex is arguably the most well-known dinosaur, due to the recovery of intact skeletons, as well as successful marketing and pop-culture influences, such as Jurassic Park, a movie of which Randall is a known fan.
  • Diplodocus
  • Velociraptor

Creatures that seem like dinosaurs, but are not[edit]

Dinosaur is a paleontology term which refers to a specific group of reptiles, based upon evolutionary lines, bone structure and living domain. However, non-experts may have difficulty distinguishing these from other extinct large reptiles/creatures and apply the term somewhat indiscriminately, hence the confusion between what is scientifically included and what is culturally assumed to be included.

The creatures listed are:

  • Mosasaurs were aquatic reptiles that existed during the Cretaceous. Although mosasaurs appeared in Jurassic World, they are not closely related to dinosaurs. They actually evolved from lizards and are most closely related to either snakes or varanoids (such as the Komodo dragon).
  • Plesiosaurs were another group of Mesozoic aquatic reptiles. Their place in the reptile family tree is debated, as they are not closely related to dinosaurs or any extant reptile.
  • Pteranodon belonged to the group of flying reptiles known as pterosaurs. While dinosaurs and pterosaurs are both archosaurs and are more closely related to each other than other archosaurs (such as crocodilians; see title text explanation below), they diverged around 250 MYA, and are distinct enough to be entirely separate lineages.
  • Dimetrodon lived in the Paleozoic, well before dinosaurs first evolved. They are synapsids, which makes them more closely related to mammals than to any living reptiles.
  • Quetzalcoatlus was a genus of flying pterosaurs, like Pteranodon, that lived in the Maastrichtian Age (the end of the Cretaceous) alongside mosasaurs, T-Rex, and many others. They were some of the largest flying animals in history, with wingspans up to 36 feet (11m). They were not, however, dinosaurs, as they had pterosaur ancestry.

Creatures that don't seem like dinosaurs, but are[edit]

Due to the popular depiction of dinosaurs as prehistoric large reptiles, many people don't view modern birds as dinosaurs. However, as Randall loves to remind people, dinosaurs such as T-rex are more closely related (temporally, anatomically, and phylogenetically) to birds than to some other dinosaurs such as Stegosaurus, and therefore, birds are dinosaurs in their own right.

Creatures that don't seem like dinosaurs, and are not[edit]

  • Squirrel: Squirrels are mammals, and dinosaurs are reptiles. Most people also think of dinosaurs as large and dangerous, while squirrels tend to be small and relatively harmless (although their bites can transmit infection.) Could also be made of dark matter.
  • Stapler: Staplers are inanimate objects, and dinosaurs are living creatures.
  • Potted plant: Dinosaurs are animals, and plants are not.
  • Human: Humans are mammals, and dinosaurs are reptiles. In fact, the Jurassic Park series often pits the two against each other.
  • Bicycle: While they tend to be more mobile than staplers, bicycles are also not living creatures.


The title text is a further joke about taxonomy, seemingly predicated on the assumption that staplers are biological organisms (which they are not),[citation needed] and can thus be sorted into taxa. Pseudosuchia is in fact the clade of archosaurs that includes crocodilians, and staplers bear a certain resemblance to the open mouth of a crocodilian. Also, "suchia" sounds a little like "suture," and in some sense staples are pseudo sutures.

The original Linnaean taxonomy did at first have a top-level classification for "mineral" taxonomy, in addition to those for animal and plant, which in its broadest sense might allow one to assign a stapler a taxonomic relationship with dinosaurs.

Transcript[edit]

[A 2x2 chart where each of the four quadrants contains five silhouettes. These depict various animals, a few objects, and a human. Above each column and to the left of each row there are a label:]
[Left column:] Are dinosaurs
[Right column:] Are not dinosaurs
[Upper row:] Seem like dinosaurs
[Lower row:] Don't seem like dinosaurs
[Here follows a list of what are in each of the four quadrants:]
[Top left (seem like dinosaurs, are dinosaurs):]
[Stegosaurus, triceratops, tyrannosaurus, diplodocus, and velociraptor.]
[Top right (seem like dinosaurs, are not dinosaurs):]
[Mosasaur, quetzalcoatlus, dimetrodon, plesiosaur, and pteranodon.]
[Bottom left (don't seem like dinosaurs, are dinosaurs):]
[Penguin, egret, falcon, pigeon, and ostrich.]
[Bottom right (don't seem like dinosaurs, are not dinosaurs):]
[Squirrel, stapler, bicycle, human (here depicted as Cueball), and potted plant.]

comment.png  Add comment      new topic.png  Create topic (use sparingly)     refresh discuss.png  Refresh 

Discussion

Make changes, try things out, or just have fun with the wiki here! Just leave everything above the line alone, please.


This is a test. PoolloverNathan[stalk the blue seas] 20:48, 16 March 2021 (UTC)

This is not. —While False (museum | talk | contributions | logs | rights | printable version | page information | what links there | related changes | Google search | current time: 00:56) 18:38, 17 November 2022 (UTC)
A foreign student asked me to help fight against his math teacher. That was unusual. He was in that class for just a couple of weeks. The teacher's phone number was sent to me. The student asked me to spam-call the teacher. 172.71.155.55 22:58, 18 September 2023 (UTC)

here i'm just messing around in html, ignore this

furhhfghure guyrburgryhuyvfr "rvhru"

interesting way of writing quotations xd

hmmm this one of putting "<p>" in a line break will come in handy for when i want it to start at the same place than the first line

Please beware that <p> on mediawiki also disables automatic paragraph breaks, so you need a closing </p> or you'll break automatic paragraph formatting for the rest of the page. Zmatt (talk) 22:06, 31 July 2024 (UTC)

edit: da hek did that "</div>" come from An user who has no account yet (talk) 14:14, 13 October 2023 (UTC)

hi uh its hard to get here. is this a reference to undocumented feature??? hmm... this is interesting.
108.162.241.216 02:05, 23 November 2023 (UTC)

Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
yum yum [citation needed]

Hiuiedeixgeyceiyedhcdiedcve {{trout}}

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Lots of people contribute to make this wiki a success. Many of the recent contributors above have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to create an account and contribute to the wiki! We need explanations for xkcd comics, characters, What If? articles, and everything in between. If it is referenced in an xkcd comic, it should be here.

  • The incomplete explanations are listed here. Feel free to help out by expanding them!

Rules[edit]

Don't be a jerk!

There are a lot of comics that don't have set-in-stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to xkcd and, of course, only submit material that can legally be posted and freely edited. Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, post a message to the Admin requests board.

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Talk:3204: Dinosaurs And Non-Dinosaurs‎‎ (12 changes | history) . . (+1,341). . [Amateurautist‎; 2a02:2455:1960:4000:9da4:59d7:1b5a:dcc3‎; 2607:fb91:5103:c3e:1873:b450:305a:44c9‎; 1.141.51.6‎; 82.13.184.33‎ (8×)]

     

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Talk:3204: Dinosaurs And Non-Dinosaurs‎‎ (4 changes | history) . . (+1,477). . [2600:100a:b12d:723e:fcd9:2b70:1145:6a44‎; 80.41.29.9‎; Martin‎ (2×)]

     

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Talk:3204: Dinosaurs And Non-Dinosaurs‎‎ (9 changes | history) . . (+3,158). . [Kev‎; 91.84.189.119‎; 81.179.199.253‎; 2a00:1e:82c2:d401:f4a3:23f3:8a2d:63b1‎; Terdragontra‎ (2×); 107.77.205.200‎ (3×)]

     

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Talk:3204: Dinosaurs And Non-Dinosaurs‎‎ (4 changes | history) . . (+538). . [TheusafBOT‎; 42.book.addict‎; 99.26.146.61‎; 2600:4041:2e5:b900:66d3:74ad:d92d:356b‎]

     

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