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In 1878 in Bernissart, Belgium, the largest find of Iguanodon specimens ever was discovered. But up to today there's still many questions about how they may have ended up there. Just how did a bunch of adult Iguanodons end up in a (then) swampy area? How did they preserve so well in the mud, with little to no weathering or signs of scavengers having picked at their carcasses? Researchers generally agree they didn't end up there because of a single mass death event. So what could have caused their deaths to happen over and over?

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Sources:

Godefroit, P., editor. (2012).
Bernissart Dinosaurs and Early Cretaceous Terrestrial Ecosystems.
Indiana University Press.

Spagna, P. (2010).
Les faciès wealdiens du Bassin de Mons (Belgique): paléoenvironnements, géodynamique et valorisation industrielle.
Ph.D. thesis, Faculté Polytechnique de l’Umons, 138 pp.

Norman D. B. & Weishampel D. B. (1990).
Iguanodontidae and related Ornithopods.
In: Weishampel, D. B., P. Dodson, & H. Osmolska, eds. The Dinosauria, first edition.
University of California Press.


#dinosaur #dinosaurs #science #biology #paleontology #birds #reptiles
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RYD date created : 2025-09-01T15:51:23.436784Z
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88 Comments

Top Comments of this video!! :3

@ThumbSipper

2 months ago

Somebody should have put a danger sign near the swamp, all this tragedy was easily avoidable...

654 | 7

@GandalfTheTsaagan

2 months ago

Oh hey, kinda like that scene in the last episode of Walking With Dinosaurs (1999) where a T. rex almost topples over when it inhales volcanic fumes when trying to eat a smaller animal that died like that.

Man, it's tough enough trying to survive an ecosystem, nevermind the very elements that host it.

243 | 0

@dee12343

2 months ago

I love how enthusiasticly yet scientific you deliver the info. It's awesome and for lack of a better word sweet.

108 | 0

@deinobi-ii

2 months ago

Longer shorts have been such a blessing for videos like these

79 | 0

@melvinshine9841

2 months ago

I think it was mentioned in the episode this came from that this comes from that the only trace of any carnivores at the site is, like, one tooth. That's the strangest part to me. You'd think that with multiple animals dying there over the course of several years that there'd be multiple theropods preserved with them, or at least traces that something was trying to eat the carcasses.

116 | 4

@Shuttle-256

2 months ago

Love the graphics.

73 | 1

@martinkois7126

2 months ago

It's great picturing the sulfide-producing bacteria as mustache-twitling villains. "You iguanadon thought you were safe! Hahahaha!!!"

100 | 0

@sphinxtheeminx

2 months ago

These shorts are great at teaching how not to jump to easy conclusions.

26 | 0

@banana-frog

2 months ago

adore these videos! they're both entertaining and informing. also rip iguanadons 💔

59 | 0

@blub5117

2 months ago

I thought the current leading theorie was a valley that's prone to flashfloods with a lot of sediment in the river and only a small outlet so it spontaniously formed a high sediment lake instantly burring them. Wouldn't gas allways result in exponentiely more juvenile fossils because it's more toxic the smaller you are?

17 | 0

@Pongo_4

2 months ago

Damn I literally just watched that full vid

22 | 0

@gladiusbladeofthenorth9939

2 months ago

They got hit by the Miyazaki swamp

12 | 0

@philipclifford2314

2 months ago

Curse you, Hydrogen Sulfide our old nemesis. You destroyed these noble animals and now seek to destroy all traces of their existence. How DARE you? 💔😢 I am sa

14 | 0

@Kyra_M

2 months ago

The iguanadons yearned for the pit

19 | 1

@Santhos_baby

2 months ago

Coming from someone who love the movie “Dinosaur” from Disney… iguanodons are the hottest dinosaurs. Period

2 | 0

@martakeczek6476

2 months ago

Wow, for all those years of knowing qbout Bernissant's Iguanodon, I never pondered about the causes;

You, Sir, are an ultimate dino knowledge delivery <3

8 | 0

@randomvielleuse527

2 months ago

Wonderful video! Great graphics, clearly explained science, and your great delivery. 10/10!

| 0

@sakuraice22

2 months ago

This reminds me of that event in which a giant cloud of CO2 descended from an inactive caldera and killed an entire village of people and all the animals around almost instantly.

13 | 0

@Afrologist

2 months ago

Iguanodon foraging aquatic plants like Moose & getting stuck in the sinkhole honestly makes more sense than this given how much Hydrogen Sulfide would have to discharge over time to take out this many animals.

1 | 0

@no_mnom

2 months ago

I thought it was leading to a burial ground of sorts where they wander off to die, but it was something just as interesting

14 | 0

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