Interspecies Conflict/Scenarios


Remember my question about creating a species of not well here are two

Xeno: a big cat , bluish gray coat , jaguar pattern , males average 360kg females 225kg , lives in North America , 4 inch claws , lives in groups up to 20 , two males to a group , 4.5 inch canines with a 2500lb bite force , second fastest cat behind cheetah (55mph top speed) excellent swimmer & climber very athletic cat

Helloid: basically a big wolverine , jet black fur , 1500lb bite force , lives in North America , 3 inch canines with 4 inch claws , males average 250kg , females 180kg , lives in groups up to 25

Can you tell me how things wil be in North America , who will dominate , what prey will they eat & who will be the biggest threat & how the predator/prey relationship will be as well as predator/predator

All animals are males for the fights below & tell me how each fight will end & how long it will last

Xeno vs 400kg grizzly
Xeno vs giant forest hog
Xeno vs 500kg polar bear
Helloid vs giant forest hog
Helloid vs hyenadon
Xeno vs hyenadon
Xeno vs smilidon populator
Xeno vs utahraptor
Helloid vs utahraptor
10 Xenos vs arctotherium
Helloid vs tiger
Helloid vs gorilla
Helloid vs bear dog
Xeno vs bear dog
Xeno vs fighting bull
Helloid vs fighting bull
Xeno vs hyenadon
Xeno vs biggest terror bird
Helloid vs biggest terror bird

Hello Anthony.

Xeno in North America: Because Xenos live in large groups, they will dominate the continent.  Even the largest herbivores (bison) will fall prey to these huge cats.  The extent of the Xenos' range isn't known precisely, but there's nowhere in North America they'll have major trouble with other predators.  Only if a single Xeno strays into an area with a very large pack of wolves or a big brown bear present will there be reason for concern.  A single Xeno entering a body of water with a large American alligator therein will need to be cautious as well.  Other predators will likely be pushed out of their territories by a group of Xenos, and will learn to avoid them for the most part.  Deer & pronghorn antelope are swift, but can be ambushed by the cats.  In order to satisfy the hunger of the entire pride, larger prey items will be targeted more often than not (bison, large cervids, boar, etc.).

Helloid in North America: As with the Xenos, the Helloids will have very few problems due to the large number of animals in a typical group.  It may take 2 or 3 of these creatures to drive a large brown bear away, and a single one can fall victim to the bruin.  A large wolf pack will cause trouble for a small group of these animals, but will probably avoid them as opposed to engaging them (they will learn that more are likely close by when a few show up).  Helloids don't have the same kind of jumping ability Xenos do (the same way a wolverine isn't going to leap like a cougar), and this will make them a little bit more vulnerable when attacking large animals like bison.  These mustelids will probably overtake any carcass they discover, and no single animal (incumbent) will be able to prevent this.  Moose & elk will be targeted often (especially in snow).  If Xenos & Helloids are both added to North America at the same time, the Helloids will need to have close to a 2-to-1 numbers advantage (or maybe 3-to-2) to make the encounter a victory for them (and on most occasions they won't have enough members).  

* we'll use the average male weight for Xeno & Helloid; using their max weights (which may be between 35-40% more than average) will likely change some of the results *

Xeno vs 400kg grizzly: A baseline for this battle is the close contest a jaguar will give a grizzly bear at equal weights.  The grizzly has a small weight advantage, but the Xeno is more formidable (pound-for-pound) than the mighty jaguar.  Xeno's ability to finish the fight quickly with its long teeth & incredible bite (ala Smilodon) gives it a great weapon against the bear.  Bears are very strong, durable, and have great stamina, but a single grizzly bear will be hard-pressed to keep this athletic cat from biting into its spine.  The grizzly can win with a few good paw swipes, and might be able to control positioning well, but won't be able to finish the cat as easily as the cat can finish it.  The Xeno will grapple with the bear initially, but will use its quickness to get into position to bring its jaws close to the bear's spine/skull.  Xeno wins; probably 4-5 minutes.

Xeno vs giant forest hog: A giant forest hog can weigh 277kg, and has tough hide & dangerous tusks.  However, considering the Xeno's many attributes (namely athleticism, gripping claws, & tremendous bite), it is tailor-made to take out a giant forest hog.  It will sink its claws into the anterior half of the boar, use its weight & strength to control positioning and keep the tusks at bay, and finish with a bite to the skull or spine.  Xeno wins; 1-2 minutes.

Xeno vs 500kg polar bear: Xeno will have trouble here.  The polar bear will be stronger, and will be able to use its forepaws to greatly hinder the movements of the cat.  Xeno won't prevail in a swipe-for-swipe battle, but will have a chance to finish with a well-placed bite.  The polar bear can win by tiring the Xeno out and ripping into it with its jaws, but Xeno can apply the tremendous bite force of its jaws into any area along the spine (or neck) and dispatch the bear.  Close to 50/50; any battle will likely exceed 5 minutes.

Helloid vs giant forest hog: The giant forest hog will weigh a little bit more than the Helloid (about 10% or so).  The Helloid won't have the same suid-killing abilities of Xeno, but will have enough weaponry to brutalize the hog in an extended fight.  The tusks will be difficult to avoid, and Helloid will likely get injured while engaging this particular adversary.  Helloid will finish with a combination of grab/claw/chew, but might be finished itself if it can't adequately keep itself from getting slashed repeatedly.  Helloid isn't going to have that "grab & control" skill that is needed to easily overcome a giant forest hog, but will have enough size & strength to keep the contest close.  Edge to Helloid; will last at least 5 minutes.

Helloid vs hyaenodon: Hyaenodon horridus was seldom larger than a big wolf, and would be no match for Helloid (or Xeno).  We'll just use Hyaenodon gigas, which is twice as heavy as Helloid.  Hyaenodon wasn't related to hyenas, but had strong jaws like them.  Helloid's focus for this fight will be "avoid the jaws", and that won't be easy (as the Hyaenodon will probably have the edge in lateral quickness).  The Helloid will have a small window of time in which to "brutalize" Hyaenodon into defeat before the huge jaws deliver serious bites.  Against an animal twice its weight, that won't be likely.  Helloid can drive Hyaenodon away in a realistic encounter, but might not get into position to use its own powerful bite in a down & dirty confrontation.  Close fight, but Hyaenodon will have the edge.  Helloid can win with a combination of biting & clawing, and Hyaenodon can win with it huge bite.  Both animals are durable; fight may exceed 5 minutes.

Xeno vs hyaenodon: Hyaenodon will weigh almost 40% more than Xeno.  Hyaenodon has a formidable bite, but that's its only offensive weapon.  Xeno's long teeth, long claws, agility, & bite force are important tools in its toolbag, and it should get into position to land a killing bite while avoiding the jaws of its opponent.  Hyaenodon can win, but it won't be favored.  Edge to Xeno with a bite to the spine or skull set up by explosive movements; 2-3 minutes.

Xeno vs smilidon populator: Smilodon populator is a little bit heavier than Xeno, and similarly armed.  However, Smilodon is a specialized hunter & killer - using its muscular build to wrestle adversaries to the ground & finish them with an impalement (using its "sabers") in a vulnerable area (usually a soft place on the neck).  Smilodon will be stronger than Xeno, but won't be as quick or athletic.  Xeno can kill more easily with its weaponry (basically a bite to any part of the spine or skull), and its very long claws can cause damage as well.  Close fight, but edge to Xeno; probably 3-4 minutes or longer.

Xeno vs utahraptor: Utahraptor will weigh about 40% more than Xeno.  Utahraptor has very versatile weaponry (decent jaws/gripping forelimbs/slashing hindlimbs), good lateral quickness, & good jumping ability.  Xeno will have the ability to rush in quickly and tackle Utahraptor to the ground (and get into a good position for a finishing bite), but will be in danger of getting kicked by the grounded theropod.  Utahraptor can win with a few well-placed slashes, but will have trouble staying upright if the Xeno is determined to treat it like a typical prey item (leap on it & drag it down).  Both animals are well-armed & unique, but Xeno has too many advantages to not be favored.  Edge to Xeno; won't last long (1 minute or so).

Helloid vs utahraptor: Utahraptor will weigh twice as much as Helloid.  Helloid isn't nearly as skilled a leaper as Xeno, and that will spell trouble for it.  It can rush in, latch on, & attempt to wear Utahraptor down, but won't be able to easily avoid the slashing kicks of the theropod.  Edge to Utahraptor by accumulation of kicks; maybe 3 minutes.

10 Xenos vs arctotherium: Arctotherium was a giant bear that was related to the modern-day spectacled bear (but was twice as tall at the shoulder & 9 times as heavy by most estimations).  The fact that Xenos hunt together is a huge plus.  From a size perspective, this is similar to 10 jaguars attacking a Kodiak bear.  The Xenos can swarm the Arctotherium and divide its focus until one gets a good bite on the bear's throat or spine, but the cats may tire out if they don't succeed at this strategy.  The Xenos may lose a member or 2, but they should succeed eventually.  Edge to Xenos; possibly 10 minutes or more.

Helloid vs tiger: The tiger will weigh slightly more.  A baseline for this battle is considering wolverines & big cats are close at equal weight, and a Helloid is a super version of one.  Helloid will have greater endurance, and should have enough ferocity to keep the tiger from easily landing a finishing bite.  Edge to wolverine; will likely drive the tiger away instead of completing a kill.  Fight may last 2 minutes or so; a kill will take considerably more time.

Helloid vs gorilla: A big gorilla can exceed 200kg in weight, but will be outweighed by Helloid (by about 20%). Gorillas are very strong primates with long arms & powerful jaws, but they aren't practiced fighters against similar-sized opponents (except other gorillas).  A Helloid will be durable enough to take what a gorilla dishes out and bring its own offense to bear.  The jaws & claws of the Helloid will be the difference.  Helloid wins; 2 minutes.

Helloid vs bear dog: The largest bear dog (Amphicyon ingens) weighed almost 2 1/2 times as much as Helloid.  Bear dogs had bear-like bodies & dog-like heads.  Helloid will be favored against a bear dog at parity, but won't be against one with this much of a weight advantage.  The bear dog will control the positioning with its strength, and finish with bites (on most occasions).  Helloid can win, but it will be a rare occurrence.  Bear dog wins; maybe 3 minutes.

Xeno vs bear dog: The bear dog will weigh about 2/3 more than Xeno.  The bear dog will be larger & stronger, but Xeno will be quicker & more athletic.  Xeno also has better tools for a quick kill (long claws/long teeth/tremendous bite force).  Still, it will be hard for Xeno to get into a good position against a stronger opponent that can use its forelimbs in a manner similar to a bear.  Close to 50/50; slight edge to bear dog.  Fight will probably last over 5 minutes; animal with the most effective bites landed will win.

Xeno vs fighting bull: A lion can kill a cape buffalo weighing twice its own weight, and the well-equipped Xeno should be able to do the same here.  Fighting bulls have muscular bodies, forward-pointing horns, and aggressive demeanors.  They can make powerful, violent charges & thrusts with their bodies.  The Xeno's speed, agility, athleticism, & unique finishing ability (bite force + long teeth) will give it a good chance to succeed, but the risk of injury is high.  Edge to Xeno; 2-3 minutes.

Helloid vs fighting bull: The fighting bull will weigh 3 times as much as Helloid.  Helloid won't have the agility to avoid getting gored by the fighting bull's sharp horns, and will be in danger of getting trampled as well.  Helloid is a formidable fighter, but doesn't have the collection of skills needed to succeed often in this particular matchup.  Its bite force (and long teeth) give it a chance to finish if it can grab & hang on long enough to apply its jaws in the right place, but it won't be easy while being tossed around by the muscular bovid.  Fighting bull wins by multiple horn impalements; 2 minutes or so.

Xeno vs biggest terror bird: The biggest terror bird was likely Kelenken, and it reached the height of an ostrich and weighed 50% more than the modern world's heaviest bird.  Kelenken had a huge beak (to strike with or deliver hard bites), and powerful legs (likely perfect for delivering strong kicks).  From a size perspective, imagine an African lion taking on an ostrich.  Xeno will have little trouble tackling Kelenken to the ground, and finishing it with a neck bite.  Xeno may eat a kick (or beak strike) on the way in, but should be able to complete its dispatching of the bird more times than not.  Xeno wins; probably 1 minute or less.

Helloid vs biggest terror bird: Helloid will have a small weight advantage, and the Kelenken will be almost 3 times as tall as the mustelid's shoulder height.  Kelenken may land a good kick or beak strike as the Helloid rushes in, but the durable mammal should be able to engage the bird with jaws & claws and bring it to the ground with the sheer weight of its own body hanging on tight.  A quick bite to the throat can spell doom for the Kelenken, and its offense will be limited once the Helloid closes the distance between them.  Actually a good fight, but Helloid is too strong & too well-armed to lose this battle.  Helloid wins; 2 minutes is possible.  

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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