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I'm talking about place similar to the Jordan desert, where the biggest prey is similar to wild donkeys and antelopes like oryx and gazelles. My creature is 1.92 meters tall and 4 meters long, looks like a monitor lizard but its limbs are located under its body and has a tail that doesn't touch the floor, making it more quick and agile. Being a large animal and living in a place without trees or dense vegetation, how would it ambush his prey? Would it be enough to put big rocks or another thing where it can hide? How would it be its camouflage? Would it hunt in packs? Or would it be better another hunt technique?

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  • $\begingroup$ Is it on Earth? An event ocurred that wiped out dinosaurs? If yes, then it has to be aquatic, like a subspecies of crocodrile. $\endgroup$ – maxisalamone Feb 26 '20 at 12:11
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    $\begingroup$ Better question how does it stay cool/cool down. a reptile exposed to the desert sun all day will fry. $\endgroup$ – John Feb 26 '20 at 20:53
  • $\begingroup$ most desert predators just hunt at night. $\endgroup$ – John Jan 20 at 17:32
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You are actually depicting Megalania - a gaint monitor lizards , varan. It's biggest (and deadliest) alive relative is Perentie - only 2 times smaller of what you need. Like any other of it's relative spices it was ambush predator. Megalania were living in desert and near it. There are some videos on youtube how varans hunting.

They do not actually need cover: they rely mostly on camouflage, tactics and, suprisely, speed. Yes, they can just chase their prey at a speed of a dog.

When they ambush, they slowly move toward their prey, preferaby from the back, from the low places. Prey in most cases do not run away even if it sees the lizard - varan is quite smart and uses special pattern of movement, so pray just thinks it passing by or laying in the sun (they learn and adjust it's behavior for each type of pray - to smart for a lizard).Then, when target is several meters apart - they quickly attack and bite legs using their sharp teeth and venom (yes they are smart fast poisonus lizard). This venom is not that deadly by itself, but it makes lizard's bite fatal even if prey gets away. So varan can just follow it and eat it when it drops.

So you don't need to invent what was already "invented in nature" - there were and and are gaint lizards with legs under body and tail above ground, leaving in the desert and hunting on any pray - from rats to cows.

P.S. I would never go to Australia wild lands. I am not that brave!

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    $\begingroup$ "I would never go to Australia wild lands." Mate, if you think the waters are more civilized, revisits the info for the Irukandji jellyfish (if exquisite levels of excruciating pain appeal to you) and the blue ringed octopus (for death by zombie toxin); unlike the monitor lizard, both of them are small cuties, you'll never notice you just upset one. $\endgroup$ – Adrian Colomitchi Feb 26 '20 at 13:35
  • $\begingroup$ ^^^ "I would never go to Australia. I am not that brave" FTFY $\endgroup$ – default locale Feb 26 '20 at 13:38
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    $\begingroup$ @defaultlocale I mean cities are quite survivable there. There would be some people around to stop you from touching "that rope" $\endgroup$ – ksbes Feb 27 '20 at 7:52
  • $\begingroup$ Compared to other parts of the world, Australia's "wild lands" are tame. There are no bears, lions, tigers, jaguars, leopards, cougars, lynx, wolverines, honey badgers, elephants, rhinos, stampeding wildebeest, short tempered murderous bees, wolves, coyotes, hyena, piranha, or boa constrictors. There's just kangaroos, emus, fluffy little possums sugar gliders, koalas, lizards, birds, dingos, nine of the most venomous snakes in the world, small bitey spiders, cassowary ... & maybe a saber toothed koala in northern Queensland, if I cross my fingers & make wish with the fairies ;-) $\endgroup$ – Fred Jan 21 at 8:12
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Ambush, sidewinder style.

sidewinder in sand

https://www.naturepl.com/stock-photo-peringuey-s-sidewinding-adder-bitis-peringueyi-hiding-in-shallow-sand-image01561641.html

Your great lizards will wriggle down into sandy spots chosen for their proximity to game trails, salt licks, or other places prey will visit. Maybe they hurl some sand and dirt up atop themselves. When the time is right they burst out and capture the prey. That is what this sidewinder is doing and that is pretty much the strategy of crocodile and alligators.

Hiding out under the sand is also good because it is cooler in there. Also, if you take a leak no-one will know.

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At night

Probably the simplest possible answer you can think of. For this, your lizard will need a sensible advantage over its prey: better night vision (like lions), echolocation (like bats) or sense of smell (like copperhead).

The lizard can ambush (leopards) or actively pursue (wolfs) its prey, hunt alone or in packs. Pursuing behavior is a little bit harder to implement with a cold-blooded creature at night, but not impossible.

As far as I can tell, Arabian wolf is the only predator close to this size in Jordan. Wolves are mainly nocturnal predators.

With traps

If you want to create a scarier ambush predator then your lizard can take an example from spiders:

  • bury itself in the sand, like a six-eyed sand spider;

  • dig a burrow and ambush its prey from it, like multiple species of trapdoor spiders;

  • build a giant web near the water source to trap antelopes, like any other spider.

For the last two options, the lizard should be able to produce silk.

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it could have very slow metabolism, meaning one catch could last long, and it should be able to hunt at night, plus, if it has super accurate thermal vision/echolocation/sense of smell/vibrations it would more likely be able to track prey succesfully, this dragon would not likely fly, for the energy consumption would be great, it could borrow itself into sand for a trap and give of a scent so animals come closer, then eat, also camouflage, could be actuall sand which is stuck by a mucose like substance that is sweated when they are prepared for the catch, the sand could help with temperature for the breath, which would probably not be fire but something poisonous, so if prey gets away, it wont be much longer till it dies

also: chlorophyl could be an alternative

P.S. I have a spanish keyboard setting, so it tries to correct words to spanish, so sorry if there are any misspelled words

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Sidewinder-style ambush. Your lizards would bury themselves completely in the sand, only leaving out their eyes. When they see the prey, they burst out and eat it. That is what Mr. sidewinder and stargazer are doing. I highly recommend that your lizard be able to stun the prey with electric shocks. Also, I recommend that the lizard have a venomous bite, to kill the prey. The burying in sand strategy will protect your lizard from the heat and prevent anycreature from being suspicious.( MLP reference here.) This is how your lizard would hunt in the desert.

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