History NightmareFuel / WalkingWithDinosaurs

** ''Liopleurodon'' is ''the'' definition of a SeaMonster, managing to make the shark from ''Film/{{Jaws}}'' look like a sardine in comparison. Its size in the series may have been greatly exaggerated (''Liopleurodon'' is actually 20 feet long, but the show depicted it as big as 75 feet long), but that still doesn't make it any less scary (in fact, you could probably say that the size exaggeration was actually ''[[RuleOfScary intentional]]'').

* The ''Koolasuchus'' from "Spirits of the Ice Forest". A huge carnivorous amphibian that acts something like a crocodile.

* Some scavengers in the series seem to like to eat ''[[EyeScream the eyes]]'' of the corpses, like ''Euparkeria'' with ''Lystrosaurus'' in ''W. W. Monsters''. And the female ''Dimetrodon'' loses an eyeball after a fight.
* The agony of the armoured herbivore ''Scutosaurus'' killed by the mammal-like gorgonopsid in ''WWM'': you can see the blood of the former gushing out of its neck!

* The distressed sounds the ''Iguanodon'' makes and its look of horror when it's being killed by the ''Utahraptor''.

* Some scavengers in the series seem to like to eat ''[[EyeScream the eyes]]'' of the corpses. And the female ''Dimetrodon'' loses an eyeball after a fight.

** It's [[JumpScare]] at the beginning of the episode. You see a ''Eustreptospondylus'' sitting on a rock near the water as the narrator talks about how the most feared predator of the Jurassic is watching his prey through the water. At first, you think he's talking about the ''Eustreptospondylus''...and then something big jumps out of the water, grabs the poor dinosaur by the tail and drags it down into the sea.

** Scowler getting DrunkWithPower after becoming leader of the herd qualifies as well. When he leaves Patchi to die after saving the herd from a frozen that he himself lead into, it looked like he had become a sociopath.

There are several gruesome scenes throughout the series.

* Earlier in "Death of a Dynasty", the battle at night between the dromeosaurid pack and the ''Torosaurus'' herd. The raptors successfully wound a baby ''Torosaurus'', who flees to the safety of the herd. However, morning comes and reveals that the baby succumbed to its injuries. We then get a shot of its' body almost entirely stripped to the bone, leaving only its head and limbs intact.

* The scene just before the meteorite hits: everything just seems to stop. The baby ''T. rex'' look out into the distance. The ''Anatotitan'' and ''Torosaurus'' herds look up at the sky. The ''Dromaeosaurus'' runs for cover. And then there's a huge flash of bright light, as the narrator explains the meteorite has struck Earth offscreen. We see the baby ''rexes'' looking into the distance at the bright light, accompanied by numerous other calls from other animals, including one that literally sounds like a child screaming in terror. The light dies down, then the shockwaves begin, rocking the Earth violently. Finally, within moments, the blast from the meteorite begins peeking out over some distant mountains as the animals of the region continue to cry out in terror. The babies are helplessly flung away by the wind, and are followed by their dead mother. The final scene set in prehistoric times is a rain of molten fire.

* Earlier in "Death of a Dynasty", the battle at night between the ''Dromeosaur'' pack and the ''Torosaurus'' herd. The raptors successfully wound a baby ''Torosaurus'', who flees to the safety of the herd. However, morning comes and reveals that the baby succumbed to its injuries. We then get a shot of its' body almost entirely stripped to the bone, leaving only its' head and limbs intact.

* The scene just before the meteorite hits: everything just seems to stop. The baby ''T. rex'' look out into the distance. The ''Anatotitan'' and ''Torosaurus'' herds look up at the sky. The ''Dromaeosaurus'' runs for cover. And then the shockwaves begin...

** ''Liopleurodon'' is ''the'' definition of a SeaMonster, managing to make {{Jaws}} look like a sardine in comparison. Its size in the series may have been greatly exaggerated (''Liopleurodon'' is actually 20 feet long, but the show depicted it as big as 75 feet long), but that still doesn't make it any less scary (in fact, you could probably say that the size exaggeration was actually ''[[RuleOfScary intentional]]'').

* The whole premise of ''Sea Monsters'' is a group of time-travelers trying to dive with and study very dangerous prehistoric creatures, so there are naturally quite a few scary moments, even though the humorous tone tries to keep it light. Special mention goes to the break between Part 2 and Part 3 where it looks like Nigel has been eaten by a 'Megalodon'', and TheStinger showing mosasaurs approaching the sonar screen as the crew sleeps.

* The scene just before the meteorite hits: everything just seems to stop. The baby T. Rexes look out into the distance. The ''Anatotitan'' and ''Torosaurus'' herds look up at the sky. The ''Dromaeosaurus'' runs for cover. And then the shockwaves begin...

* Some scavengers in the series seem to like to eat ''the eyes'' of the corpses. And the female ''Dimetrodon'' loses an eyeball after a fight.

* New Blood: It's not surprising if any kid back in 1999 that saw the series for the first time has been scared by the death of [[spoiler: the baby cynodont who wandered too far]] and the look on [[spoiler: the ''Postosuchus''' face as she dies (she's drooling, and her eyes are ''blood red'')]]

** ''Liopleurodon'' is ''the'' definition of a SeaMonster, managing to make {{Jaws}} look like a sardine in comparison. Its size in the series may have been greatly exaggerated (''Liopleurodon'' is actually 40 feet long, but the show depicted it as big as 75 feet long), but that still doesn't make it any less scary (in fact, you could probably say that the size exaggeration was actually ''[[RuleOfScary intentional]]'').

* The whole premise of ''Sea Monsters'' is a group of time-travelers trying to dive with and study very dangerous prehistoric creatures, so there are naturally quite a few scary moments, even though the humorous tone tries to keep it light. Special mention goes to the break between Part 1 and Part 2 where it looks like Nigel has been eaten by a ''Dunkleosteus'', and TheStinger showing mossasaurs approaching the sonar screen as the crew sleeps.

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[[caption-width-right:590:If you thought ''Film/{{Jaws}}'' was scary...]]

[[caption-width-right:590:If you thought ''Film/Jaws'' was scary...]]