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Interspecies Conflict/Even more balanced and unbalanced matchups

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Question
Hi it's 1.30 AM as I ask this question and your available and I've got nothing better to do at the moment. Plus from the looks of it you haven't answered a question in over a week.

1. Giant Cheetah vs. Snow Leopard
2. Long Horned Bison vs. Black Rhino
3. Dunkleosteus vs. Helicoprion
4. Deinocheirus vs. Terror Bird
5. Dimorphodon vs. Argentavis
6. False Orca Whale vs. Great White Shark
7. Sand Tiger vs. Cookie Cutter Shark
8. Bull Shark vs. Hammerhead Shark
9. Spanish Bull vs. Forest Buffalo
10. Jaekelopterus vs. Eurypterid
11. Elasmotherium vs. Triceratops
12. Arctotherium vs. Jefferson Ground Sloth
13. Oarfish vs. Anaconda
14. Albertosaurus vs. Allosaurus
15. Giganotosaurus vs. Carcharodontosaurus

Unbalanced Matchups

1. Smilodon vs. Walrus
2. Megatherium vs Long Horned Bison
3. Tapir vs. Wild Boar
4. Indricotherium vs. Spinosaurus
5. Bull Elephant Seal vs. Bluefin Tuna
6. Titanoboa vs. Colossal Squid
7. Pachycephalosaurus vs. Bull Gaur
8. Allosaurus vs. Saltwater Crocodile
9. Megalenia vs. Utahraptor
10. Terror Bird vs. Silverback Gorilla
11. Velociraptor vs. Baboon
12. Giant Tropical Centipede vs. Japanese Giant Hornet
13. Goliath Birdeater vs. King Crab
14. Mantis Shrimp vs. Tiger Leech
15. Giant Huntsman Spider vs. Stag Beetle

It took me a half an hour to think up all tthese questions can you believe it so now its after 2.00 AM. I don't expect a quick response after all this is my longest question to date so take as long as you need. I'm sure this will make up for your week of absence.

Answer
Hello Max.


1. Giant Cheetah vs Snow Leopard: The giant cheetah (Acinonyx pardinesis) weighed about 60% more than a snow leopard.  Like today's cheetahs, the giant cheetah was built for speed and not combat.  A snow leopard is much more formidable (pound-for-pound) than any cheetah due to its more muscular body, larger jaws, and sharper claws.  Snow leopard wins.

2. Long-Horned Bison vs Black Rhino: These animals can weigh close to the same, but the long-horned bison (Bison latifrons) typically weighed about 1/3 more.  The long-horned bison had 2 long horns that pointed out from each side of its head (and curved upwards), but the black rhinoceros has a forward-pointing frontal horn that is positioned better for combat.  The tank-like build & tough hide of the black rhino make it a formidable adversary for anything close to its weight range.  It would inflict more serious injuries to the long-horned bison than the other way around.  Black rhino wins.

3. Dunkleosteus vs Helicoprion: Dunkleosteus was several times heavier than Helicoprion.  Dunkleosteus (giant armored fish) was protected by armor on the anterior half of its body, and its jaws were tremendously strong.  Helicoprion was a prehistoric shark (or shark-like fish) with an odd set of jaws (with its teeth rolled up).  Dunkleosteus would have been able to incapacitate the smaller fish with a bite or 2, and would have been relatively safe from its initial offense.  Dunkleosteus wins.

4. Deinocheirus vs Terror Bird: Deinocheirus was several times heavier than the largest terror bird (Kelenken).  This dinosaur was armed with clawed forelimbs that likely provided strong defense as well as offense.  Kelenkens had strong legs for running (and perhaps kicking), and large beaks for biting/striking.  Terror birds were good competition for opponents close to their weight range, but Deinocheirus was simply too big.  Deinocheirus wins.

5. Dimorphodon vs Argentavis: Argentavis was much larger than Dimorphodon.  Argentavis was likely similar in build & function to modern-day vultures, and had a wingspan over twice that of any of them.  Dimorphodon was a lightly-built pterosaur, and had a proportionately large skull (10" in length & robust).  Its beak contained fang-like teeth suitable for ripping apart fish.  Argentavis was simply too large for Dimorphodon to handle.  Argentavis wins.

6. False Killer Whale vs Great White Shark: The great white shark will weigh approximately 50% more than the false killer whale.  Great white sharks have huge jaws with razor-sharp teeth, but aren't exceptional face-to-face fighters (but are highly-skilled ambush predators).  False killer whales are formidable hunters with conical teeth on their upper & lower jaws.  These mammals are swift, mobile swimmers (horizontal tail flukes allow for strong forward momentum & direction change), and one would be able to easily outmaneuver a great white shark.  The false killer whale's weaponry isn't as impressive as the great white shark's, but its agility makes up for that.  The false killer whale will likely win a normal encounter, but a serious battle to the end may favor the great white shark because it has the ability to inflict enough damage with a single bite to disable the mammal (and this may occur if the false killer whale stays in range by continuously attacking).  Depends on how you look at it.

7. Sand Tiger vs Cookie Cutter Shark: The sand tiger shark is much larger (up to 7 times longer) than the cookie cutter shark.  The sand tiger shark is a slow, strong swimmer with a large mouth armed with spaced, pointed teeth.  The cookie cutter shark leaves a bite mark shaped like a circle.  The sand tiger shark would eventually catch the smaller fish in its jaws and end the fight.  Sand tiger wins.

8. Bull Shark vs Hammerhead Shark: The hammerhead shark can weigh close to double the bull shark's weight.  These sharks have similar builds, but the hammerhead shark has a proportionately smaller mouth (and a hammer-shaped head!).  A bull shark would win at parity, but would lose at normal weights.  Hammerhead shark wins.

9. Spanish Bull vs Forest Buffalo: A Spanish fighting bull can weigh double the weight of an African forest buffalo, but will only be about 1/3rd heavier than a very large one.  Spanish bulls have forward-pointing horns that are well-placed for impalement, and can make violent, forceful movements with their muscular bodies.  The African forest buffaloes have curved horns that line up with the plane of the forehead.  The larger, more aggressive Spanish bull wins.  

10. Jaekelopterus vs Eurypterid: Among the eurypterids, Jaekelopterus is believed to be the largest.  Pterygotus was close in size (and had the same weaponry/attributes), and is probably the closest matchup for it among eurypterids.  Arthropleura, for one, had the size but not the weaponry (no grabbing claws), and Eurypterus (to name another) would have been too small.  Jaekelopterus probably has the edge against any eurypterid.

11. Elasmotherium vs Triceratops: Triceratops weighed at least 20% more than Elasmotherium, but could get significantly heavier.  Elasmotherium had a long, thick horn protruding from its forehead area, and Triceratops had 2 long, sharp brow horns that were likely used to repel large theropods like Tyrannosaurus.  The frill of Triceratops probably provided decent protection for its shoulder & neck area.  Both could win, but Triceratops was larger & better armed.  Triceratops wins.

12. Arctotherium vs Jefferson Ground Sloth: Arctotherium (South American short-faced bear) weighed about 75% more than Jefferson's ground sloth (Megalonyx jeffersonii).  The ground sloth, when standing upright, would have been about 2/3 taller than the bear's shoulder height (while on all fours).  Arctotherium was related to the modern spectacled bear, but was about 9 times as heavy.  Bears are durable mammals with good weaponry (strong jaws, forelimbs to grab/control/swipe, long claws) & great endurance.  The ground sloth had long, clawed forelimbs to swipe with, but the larger bear would have overpowered it.  Arctotherium wins.

13. Oarfish vs Anaconda: Despite its tremendous length (26' or more), the oarfish isn't heavily built, and weighs much less than the shorter (but much more robust) anaconda.  Oarfish feed upon nothing larger than small fish & squid, and would not be a serious threat to a large constrictor like anaconda.  Anacondas are capable of suffocating animals twice its own weight in its coils, and the oarfish would have no means of escape once the snake seized it.  Anaconda wins.

14. Albertosaurus vs Allosaurus: Albertosaurus was typically a bit heavier than Allosaurus (by about 25%), and had a light build (suggesting it may have been able to pursue fast prey).  The jaws of Albertosaurus were armed with sharp teeth designed to cut like steak knives, and its stocky head (with reinforced skull bones) rested on a thick neck.  Allosaurus had a massive, deep skull (but not a heavily built one) with jaws armed with serrated teeth.  The Allosaurus had a huge gape, and could have used it to bite in a slashing motion.  The Allosaurus' bite was probably more effective & diversified overall than the Albertosaurus', but the weight advantage here would be enough to favor Albertosaurus (although at parity I would favor Allosaurus).  Edge to Albertosaurus.

15. Giganotosaurus vs Carcharodontosaurus: These 2 theropods were close in weight (over 8 tons each), and had similar attributes.  Both had long skulls, powerful jaws, & triangle-shaped teeth (8" long) with serrated edges.  There is some disagreement about which theropod was actually larger, but both were larger than their famous counterpart Tyrannosaurus.  Probably a 50/50.


Unbalanced Matchups

1. Smilodon vs Walrus: The walrus weighs over 4 times as much as Smilodon populator did.  Walruses have very tough hide that covered a thick layer of blubber, and this affords them great protection against many attacks (mainly from polar bears).  They can also use their meter-long tusks to defend themselves.  Smilodons were powerfully-build felids with long upper canines used to penetrate the soft neck areas of opponents.  These predators used their forelimbs to wrestle victims to the ground where a good position could be obtained to deliver a bite with its 8" sabers.  Walruses aren't very mobile on land, and a smilodon could have leaped upon it without worry of a counter-attack.  As long as the smilodon didn't try to stab through the tougher parts of the walrus' hide it would be able to mortally wound the pinniped during the struggle.  It would take a while, but a large Smilodon populator could succeed here.  Smilodon fatalis & Smilodon gracilis were probably to small to pull this off.  Smilodon wins.

2. Megatherium vs Long-Horned Bison: Megatherium (giant ground sloth) weighed over twice as much as a long-horned bison (Bison latifrons), and stood 2 1/2 times as tall when upright.  Megatherium's hide (underneath the hair) was covered with small pieces of bone that formed an armor like chain-mail, and this would have provided protection from the long-horned bison's charges.  Its massive forelimbs were armed with claws, and it could have swung these to repel the charging bovid.  good battle at parity, but here the giant sloth is too big.  Megatherium wins.

3. Tapir vs Wild Boar: Some larger tapirs weigh twice as much as a wild boar.  Tapirs are typically peaceful herbivores, but can deliver nasty bites when provoked.  Wild boars have tough hides, good lateral movement, & sharp tusks that can be used to slash at adversaries.  A large tapir might be able to drive a wild boar away in a normal encounter, but a determined boar has too many assets to lose a down & dirty battle.  Edge to wild boar.

4. Indricotherium vs Spinosaurus: Indricotherium (Paraceratherium) may have weighed over twice as much as Spinosaurus.  Indricotheriums were huge; generally believed to be the largest mammal to ever walk the earth.  Upper-limit estimates for its shoulder height are nearly 5.5 meters (and its head towered almost 8 meters off the ground).  Weights of over 20 tons have been assigned to this animal as well.  It may not have gotten quite this big, but it was still quite massive.  A full-grown Indricotherium had no enemies (except perhaps another Indricotherium), and its behavior in combat hasn't been pinpointed.  It likely didn't need to have any real fighting ability due to its size advantage over any would-be predators of its time.  What Indricotherium was capable of is largely suppositional, but it's plausible to assume it could cause injury to another animal by trampling or charging (to create a jarring impact).  It probably could deliver a nasty bite (similar to what an Indian rhinoceros might do).  Indricotherium had a heavy skull with a domed forehead, and may have used this as a battering ram (similar to modern-day bison).  Without any formidable enemies, the adults probably weren't practiced at battling other species of animals.  Spinosaurus was among the largest carnivores ever to walk the earth (even heavier than Tyrannosaurus), but its jaws were designed to catch fish & weren't as powerful as those from other large theropods.  Still, its jaws would have been able to cause some damage to the slower Indricotherium, but it might have taken an accumulation of bites to overcome the huge mammal.  Hard to say without knowing Indricotherium's true fighting ability, but I'd probably give the slight edge to Spinosaurus.

5. Bull Elephant Seal vs Bluefin Tuna: A bull elephant seal can weigh over 4 times as much as a bluefin tuna.  Elephant seals are mobile swimmers, and have decent bites (can be a dangerous prey item).  Bluefin tunas are fast swimmers (can reach 43mph), and have small sharp teeth.  The elephant seal won't be quick enough to catch the bluefin tuna, and the tuna won't have a formidable enough bite to overcome the seal.  Probably a stalemate here.

6. Titanoboa vs Colossal Squid: Titanoboa weighed more than double the weight of a colossal squid.  Both animals would be trying to "wrap the other one up" in a struggle, and the relatively supple bodies of each would make this challenging for both.  The squid would try to use its tentacles to ensnare Titanoboa, and use its hard beak to bite the snake.  Titanoboa would latch on with its jaws & use its body to encircle the squid & squeeze.  The colossal squid is somewhat sluggish, but can quickly wrap up something that comes in contact with it.  Titanoboa will be the stronger animal (packed with muscle), and will likely be able to put its coils where it wants to regardless of the squid's attempts to resist.  If Titanoboa coils around the mantle of the squid (which will likely happen), it will have the strength to collapse it (and damage the organs within).  This is a unique battle, and one that's hard to envision, but the heavier animal would be favored.  Titanoboa wins.

7. Pachycephalosaurus vs Bull Gaur: The bull gaur will weigh at least double the dinosaur's weight.  Pachycephalosaurus had a thick dome of bone on its skull close to 10" thick, and it may have used this to headbutt rivals & enemies (much like the bighorn sheep does today).  Gaurs are powerful bovids with thick, curved horns that are used to defend themselves against predators (mainly Bengal tigers).  The horns of the larger gaur would have more effect on the Pachycephalosaurus than the dinosaur's skull would have on it, and can be more readily wielded.  Gaur wins.

8. Allosaurus vs Saltwater Crocodile: Allosaurus weighed about twice as much as a large saltwater crocodile.  Crocodiles are well-armored & armed with vice-like jaws, but their poor mobility & stamina makes them less effective on land than in the water.  The powerful, shearing jaws of Allosaurus would have been able to breach many areas on the saltwater crocodile, and its better mobility would give it an advantage in its attack.  Even in water, the crocodile won't have the size to manipulate Allosaurus as long as the theropod isn't in water too deep.  Once the water depth is such that Allosaurus' movement is restricted, the saltwater crocodile will have a chance, but it's giving up a lot of weight here.  Allosaurus wins.

9. Megalania vs Utahraptor: Utahraptor weighed a little more than 40% of Megalania's weight.  Megalania was a giant monitor lizard (but stockier) with similar attributes as modern-day ones (tough hide, sharp teeth, whip-like tail), and may have had a toxic bite like today's Komodo dragons do.  Utahraptors had diverse weaponry (sickle-like claw on foot for slashing, decent bite, claws on forelimbs) and good agility.  The effect of Utahraptor's offense would be tempered somewhat by Megalania's scaly hide, but its agility would have made avoiding the monitor's formidable bite a decent possibility (especially if it leaps upon Megalania).  Still, any bite by Megalania would be trouble for Utahraptor.  Utahraptor would win handily at parity, but it's too light to be favored here.  Slight edge to Megalania.

10. Terror Bird vs Silverback Gorilla: The largest terror bird (Kelenken) will weigh slightly more than a large silverback gorilla.  Terror birds have large beaks to bite/strike with, and strong legs with which to run down prey (and perhaps deliver powerful kicks like a modern-day ostrich).  Gorillas are strong primates with long arms, grabbing hands, and decent bites.  They aren't practiced at combat with other animals (except perhaps other gorillas), and use intimidation over actual force.  A gorilla has the physical attributes to overpower a smaller terror bird (Gastornis/Phorusrhacos), but won't have the know-how.  A Kelenken would be too large & formidable for a gorilla to deal with.  Gastornis & Phorusrhacos might have trouble if kicking wasn't in their repertoire, but a larger terror bird would still have enough offense with its large beak to repel a gorilla.  Edge to terror bird.

11. Velociraptor vs Baboon: A larger baboon (like an olive or a chacma) would weigh over 2 1/2 times more than Velociraptor, and would have a decent chance to overpower the smaller reptile.  Velociraptors are quick & agile, and have decent bites, clawed forelimbs, & sickle-shaped kicking claws.  Baboons have good mobility (and are actually good leapers) and weaponry (grabbing hands, sharp canines), and can be a dangerous adversary for many attackers (including leopards).  A larger baboon would be able to use its hands to grab and control some of the Velociraptor's movement and deliver several serious bites before taking too much damage itself.  A baboon with a decent weight advantage will be favored.  Edge to baboon.

12. Giant Tropical Centipede vs Japanese Giant Hornet: The giant tropical centipede will be many times heavier than the Japanese giant hornet.  The hornet has a tough exoskeleton, shearing mandibles, & a venomous sting.  However, centipedes also have a tough exoskeleton, and have a pair of sharp claws (called forcipules) that can penetrate victims to inject venom.  Centipedes are very quick & flexible, but it's unlikely one can consistently snare an attacking hornet in mid-flight.  The hornet will need to find a vulnerable spot on the larger creature in order to use its stinger, and will need to be wary of a counter-attack.  Both are relatively well-protected from one another, but the flying ability of the hornet can't be discounted.  Still, the larger centipede might have enough quickness to grab the hornet when it comes in to sting, and the hornet might not be able to escape from its claws.  Tough one to call, but edge to giant tropical centipede.

13. Goliath Birdeater vs King Crab: A king crab will be much heavier & better protected from attack than a goliath birdeater (spider).  Its shell will make it very difficult for the spider's fangs to find its mark, and this alone will be enough to favor the crab in this matchup.  King crab wins.

14. Mantis Shrimp vs Tiger Leech: Tiger leeches are slimy creatures that can suck fluids from animals they attach themselves to (which can result in the demise of the victim).  Mantis shrimp have a claw that is primarily used to strike victims with, and one can do this with a lot of force (can crack the glass of an aquarium).  A tiger leech can kill a mantis shrimp by ambush, but the shrimp should be quick enough to avoid the leech's attack more times than not and bash it with its claw.  The tiger leech won't be as affected by the strike as a more solid animal will due to its soft body, and might be able to counter the shrimp's action by finding a vulnerable spot to latch onto to.  Tough call, but I would probably give the edge to the tiger leech.

15. Giant Huntsman Spider vs Stag Beetle: The giant huntsman spider is a larger creature, but it's not as heavy as the stag beetle.  Stag beetles are strong, well-armored, and have large mandibles.  The spider will find it very difficult to land a meaningful bite, and won't be able to escape if grabbed by the stag beetle.  Stag beetle wins.


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.

Experience

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.

Education/Credentials
Associate degree in unrelated field; biology classes in college.

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