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Interspecies Conflict/island adaptability 2.


QUESTION: hello bk its Daren again and i hope your doing well. it seems that the questions for the first page cannot be extended so i have to make a part 2 in order to continue this. so along with the creatures from previous questions how would this set of creatures do against whats already there? i look forward to the answer as always =)

Shastasaurus sikanniensis

ANSWER: Hello again Daren.

This will change the hierarchy in the oceans for sure.  Dunkleosteus has been the dominant presence in the water, but that's about to change.

Shastasaurus sikanniensis: Widely considered to be the largest aquatic reptile ever, this creature was the size of a sperm whale.  Its body was shaped like a dolphin's, but had two large flippers on each side of its body.  It had no teeth, but its large size would make it safe from other predators in this ecosystem.  Sub-adults might be attacked by Dunkleosteus.

Fasolasuchus: This predator resembled a slender, long-legged crocodile.  It reached 30ft in length and weighed more than an average hippopotamus.  It would have been a dominant land carnivore in this ecosystem, attacking most other animals in its weight range including Edaphosaurus, Placerias, Desmatosuchus, Moschops, and possibly Scutosaurus & Ischigualastia (among others).  Other land predators like Ivantosaurus, Inostancevia, and Dimetrodon would have given way to this animals.

Redondasaurus: This animal was similar to a crocodile, but it was huge.  Almost 40ft long and as heavy as 2 elephants, the Rendondasaurus patrolled lakes & rivers.  Anything that ventured into the water would be fair game.  Prionosuchus might cross paths with it here, but the amphibian would be no match for it.  Even if it came onto dry land, the Rendondasaurus would be unchallenged.  If it somehow made its way to the ocean and entered it, it would be able to successfully predate on most animals therein.  The Shastasaurus would be way out of its league, and the Dunkleosteus would have been a very dangerous rival.  Being over twice its weight, it might could kill a Dunkleosteus with a bite on the rear half of its body (unarmored), but the giant armored fish could easily bite through any part of the Redondasaurus.  This would have been a close battle.

Effigia: This woodlands inhabitant was a slender, bipedal creature that was about 10ft long and weighed about 2/3rd of Dimetrodon.  It would have eaten small animals, and would have given way to predators of Dimetrodon's size and up.  Would have shared its habitat with the larger Desmatosuchus, but would only have been able to prey on sub-adults of this species.

Placerias:  This animal was a herbivore similar in size & appearance to a Moschops (but more hippo-like).  It would probably frequent the grasslands in this ecosystem.  Dangers would include Fasolasuchus, Ivantosaurus, and perhaps Inostroncevia.  Would have probably hung out with Ischigualastia.

Cymbospondylus: This was a smaller, more slender version of the Shastasaurus, but it was still a large animal (25ft long and up to 2 tons).  Primarily ate fish at the ocean's shore.  Would have likely fed on Chinlea & Paramblyterus.  Probably would tolerate Hyneria and vice-versa, but friction might occur.  Dunkleosteus would have been a grave threat.

Desmatosuchus: This was a forest-dweller, shaped like a stout lizard (with spiny protrusions on its shoulders), and about 15ft long.  It weighed up to half a ton.  Would have been civil with Moschops, Scutosaurus, Edaphosaurus, Ischigualastia, and Placerias.  Dangers would have included Fasolasuchus, Ivantosaurus, Inostroncevia, and Dimetrodon.

Ischigualastia: Similar to Placerias, but twice as heavy.  Would have been a prey item for Fasolasuchus, and the larger, bolder representations of Ivantosaurus and Inostroncevia may have given it trouble.

Chinlea: This fish was about 5ft long and weighed about 150lb.  It had long, sharp teeth reminiscent of a barracuda (It probably behaved in much the same way, too).  Any small marine life would be on the menu, and dangers would include Hyneria, Dunkleosteus, and Cymbospondylus.

Henodus: This was a 3ft long sea turtle that could weigh 20lbs.  It would have probably shared bodies of water with Redondasaurus & Prionosuchus, and fallen victim to them both.  Any venturing to the shoreline of the ocean would put in at risk from Hyneria.

The large variety of animals in various parts of this ecosystem will make it difficult for some to thrive as they normally would.  Prionosuchus, for example, will find it hard to compete for food (and survival) against the much more formidable Redondasaurus.  It would probably be driven out of its comfort zone if Redondasaurus decides to take up residence in the swamp.  Being forced into an area it's not adapted to would prove problematic (prey it can't catch/predatory conflicts with new animals).  With more threats being planted near the shore, Diadectes (for one) might find every day a fight to survive.  This, of course, is dependent on how many of each animal is inserted in each spot.  These animals will react instinctively to preserve themselves the best they can, but nothing can replace the time and evolution required to make the transition realistic.  Even an over-abundance of plant-eaters in a particular area can be a threat to a smooth-running ecosystem.  If plants & grass are consistently removed from an area from over-grazing, those animals will be forced to move elsewhere to feed.  The new location will probably be less suitable for them to survive as a species.  There's no sure way to predict which animals will succeed and which ones will fail, but a mixture of various time periods is likely a recipe for disaster.

Best regards.

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QUESTION: always appreciate your help BK and i did give into some though as to how much time between each introduction so that the environment will be able to recover a little and how many animals should be introduced between each time frame would 500 predators and maybe 5000 herbivores be balanced enough for a start so that inbreeding wouldn't be a concern then wait 1000 years between each introduction since 1000 years would pretty much be nothing in geological time. also heres the next list of animals to work with from the early and middle Jurassic

Megateuthis gigantean
Leedsichthys problematicus

also before the next list who was bigger pliosaurus funkei or pliosaurus macromerus?

looking forward to your answer as always and hope your having a nice day :)

ANSWER: Hello Daren.

Temnodontosaurus: This animal resembled a giant dolphin, and reached the length of a killer whale (and was almost as heavy).  It would patrol the shores looking for squid & fish, but could also be found in the deep oceans.  It would probably co-exist somewhat peacefully with Shastasaurus, Cymbospondylus, and perhaps Hyneria (Hyneria wasn't big enough to attack Temnodotosaurus, and Temnodotosaurus probably would have had no interest in large vertebrates).  Dunkleosteus was probably too slow overall to be a threat to an alert Temnodotosaurus, but it would be a predator to keep an eye on.  If it got close enough, a sudden lunge would put the giant armored fish in position to deliver a damaging bite with its powerful jaws.

Hypsocormus: This stout fish was a predator that exceeded 3ft in length.  It would be a danger to smaller ocean-dwellers, and prey for larger ones (like Hyneria, Chinlea, Cymbospondylus, etc.) and would need to keep an eye out for Dunkleosteus.

Megateuthis Gigantea: This cephalopod reached almost 11ft long (imagine a squid without the 2 long tentacles) and primarily ate fish.  Would have probably been a menace to young Hypsocormus, possibly Cacops, Paramblypterus, etc.  Would have been a prey item for Hyneria & any other large ocean-dwelling predators that crossed its path.  If the Redondasaurus ever ventured into the ocean, the Megateuthis would be on its menu.

Leedsichthys Problematicus: This whale-like sea creature was huge, with estimates for its length ranging from 30ft to 50+ft.  It primarily ate plankton.  Its large size would keep it safe from most sea predators, but Dunkleosteus would have been one to avoid.  Probably would co-exist amicably with Temnodotosaurus, Titanichthys termieri, and perhaps Shastasaurus.

Pliosaurus Funkei & Pliosaurus Macromerus:  There is a lot of variation in the size of these animals ranging from the conservative to the absurd.  The Pliosaurus Funkei (famously known as Predator X) was probably close to 40ft in length and weighed almost as much as 3 elephants (some sources state an incredible 50ft in length and almost 50 tons in weight, but those measurements are unsubstantiated).  A jaw measuring over 9ft in length is the best barometer for guessing Pliosaurus Macromerus' length.  Pliosaurs typically have heads approximately 20% the length of their bodies, which would place the Pliosaurus Macromerus somewhere in the range of 45+ft.  If these estimations for each creature are correct, the Pliosaurus Macromerus would be a little bit longer.  The builds of these 2 pliosaurs were quite similar (presumedly), so at these lengths the Pliosaurus Macromerus would probably weigh close to 50% more than the Pliosaurus Funkei.

Best regards.

---------- FOLLOW-UP ----------

QUESTION: hey bk long time no speak. the reason i haven't asked something in a while is because my family moved and we have no internet so i have to use the local library internet. anywho.

the next set of creatures Ive got are from the late Jurassic and early cretaceous.

Pliosaurus macromerus
Diplodocus hallorum
Iguanodon bernissartensis

also i took your advice and decreased the number of species already on the island so whenever your ready to answer include these critters.

Titanichthys termieri
Shastasaurus sikanniensis
Megateuthis gigantean

hope to hear your answer soon. :)

Hello again Daren.

I'm assuming you mean that the animals listed in the second set are the ones currently in the ecosystem, and the animals in the first set are the new animals you want to introduce.  As I go down the list, I will integrate the creatures mentioned prior (as well as the ones already in the ecosystem).

Pliosaurus macromerus: This pliosaur probably weighed more than 4 elephants, had 4 flippers for effective navigation (and high speeds in short bursts), and very powerful jaws.  It would be a true terror for just about every other animal it encountered.  Even the huge Shastasaurus sikanniensis would have needed to be wary around this pliosaur.  Temnodontosaurus, Leedsichthys, Titanichthys termini, & Redondasaurus (if it decided to go ocean-bound) would have been outmatched by Pliosaurus macromerus.

Leptolepis: This small bony fish would have fallen victim to larger fish (like Hypsocormus) and aquatic reptiles.

Pholidophorus: This fish was also small, but larger than Leptolepis.  Would have been preyed upon by larger fish (like Hypsocormus) and aquatic reptiles, and might have attacked a small Leptolepis.

Pachycormus: This fish was about the size of Hypsocormus, and may have behaved similarly.  Temnodontosaurus would have been one of its many dangers.

Stegosaurus: Stegosaurus weighed about as much as an African forest elephant.  It has plates arranged vertically along its back and 4 long spikes attached to the end of its tail (this could be swung as a self-defense weapon).  Smaller ones would have to worry about Fasolasuchus & Redondasaurus (if it ventured near waterways), but an adult Stegosaurus would have likely been too large for these predators.

Diplodocus hallorum: This extremely long (over 80ft!) sauropod weighed between 10-15 tons.  It would have mingled peacefully with Stegosaurus, Scutosaurus, Desmatosuchus, & Ischigualastia.  Fasolasuchus would not be large enough to tackle adults, but Redondasaurus may have been trouble for ones at the water's edge.

Ornitholestes: This lightweight, speedy theropod preyed on small to medium sized animals.  It was not large enough to take on most of the animals here (possibly Sclerocepalus, though), but may have had more success in a group.  Would have hunted alongside Effigia and possibly competed with it.  

Dryosaurus: This forest-dwelling dinosaur ate leaves, and weighed as much as an average man.  It had powerful legs for running.  Ornitholestes wouldn't have been a threat one-on-one, and the Effigia (depending on the weight estimation used) probably wouldn't have either.  Fasolasuchus would have been a major danger, but the Dryosaurus likely had the speed to escape if it remained alert.  Would likely have peacefully co-existed with Scutosaurus, Desmatosuchus, & Ischigualastia.

Mawsonia: This fish may have reached half-a-ton, and would have been a prime target for Redondasaurus.  It would not be a target for Shastasaurus, Titanichthys, or Temnodontosaurus despite the large size of those creatures.

Onchopristis:  This animal resembled a sawfish, and probably weighed a ton.  It would have likely preyed on fish, and Leptolepis & Pholidophorus would have been on the menu.  Would have possibly been attacked by Redondasaurus, and would have used its rostrum (beak) for self-defense.

Lepidotes: Another small fish that would have fallen prey to larger fish (like Hypsocormus) and aquatic reptiles.  Onchopristis would have targeted it.

Spinosaurus: Estimates for the size of Spinosaurus vary, but it was likely somewhere between 1 & 2 elephants.  It would have fed on Onchopristis, Mawsonia, and any smaller fish.  Would have likely attacked Sclerocephalus, Scutosaurus, Fasolasuchus, Effigia, Desmatosuchus, Ischigualastia, Megateuthis gigantean, Stegosaurus (but might have been repelled on occasion by its tail spikes), Diplodocus, Ornitholestes, Dryosaurus, & possibly others.  By patrolling the water's edge, Spinosaurus would come into contact at times with Redondasaurus.  Spinosaurus' jaws would have trouble penetrating the armor-like hide of Redondasaurus, but a battle on land would probably favor the Spinosaurus if the weights were similar.  In the water, however, Redondasaurus would likely have the edge.  

Iguanodon bernissartensis: Iguanodon bernissartensis was about 30ft long & weighed about as much as an African forest elephant.  It had spikes on its thumbs that may have been used to jab at enemies. Iguanodon probably got along well with other herbivores, but would have been a target for Fasolasuchus & Spinosaurus if the sizes were close with each animal.  Redondasaurus would be a threat at the water's edge, and Iguanodon would have been wise to avoid it on land as well.

Cretolamna: This fish was about the size of a bull shark, and resembled it.  It would have eaten the smaller fish, possibly the Mawsonia & Megatuethis, and would have had run-ins with the Onchopristis (and probably come out on the worse end of it).  Dangers would include Spinosaurus (if the 2 met at the water's edge) & Redondasaurus.  Would likely be bullied by Temnodontosaurus if they met.

Utahraptor: Utahraptor weighed over half-a-ton, and was a dangerous predator armed with large jaws & deadly claws (to kick & slash with).  It hunted in groups, and would have been a danger to almost every other terrestrial animal in this ecosystem (Spinosaurus & Stegosaurus would have been worthy adversaries against a group of Utahraptors).

Best regards.

Interspecies Conflict

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Questions regarding animal conflicts within realistic or unrealistic settings are welcome; my strength lies in medium-to-large species. Small animals (including birds of prey), prehistoric animals, sea creatures, and domestic dog breeds are usually within my scope, but to a lesser degree. I can't confidently answer hypothetical questions about human vs animal, arachnids, insects, or amphibians, but I am willing to field them nonetheless.


From a young age, I have been interested in animals. Starting with the original Mutual of Omaha's Wild Kingdom and World Book Encyclopedias, I have seen many animal shows and documentaries and have read multiple books on the subject. I have a solid understanding of the physiology of many animals and interspecies conflict in general.

Associate degree in unrelated field; biology classes in college.

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