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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,468 Views)
CyborgIguana
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Well in that case, I think it's a very safe bet that pterosaurs were endothermic, even if dinosaurs weren't.
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stargatedalek
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I'm not slow! That's just my moe!

I still think its plausible for a powered flight exothermic animal besides insects to exist

I just don't think pterosaurs were that animal

I think if pterosaurs were endothermic, that would point towards the ancestors of dinosaurs being endothermic as well
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Bigwhale
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What probably controlled the anurognathid population? I mean universally.
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Even
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Larger pterosaurs, tree dwelling carnivores..
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Bigwhale
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Yeah, but from what family :P ?
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Furka
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Bigwhale
Jun 16 2014, 02:30 AM
What probably controlled the anurognathid population? I mean universally.
Lack of food, loss of environment, diseases, competition with other sapecies ...
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Mathius Tyra
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Rat snake is love... Rat snake is life

Bigwhale
Jun 16 2014, 02:49 AM
Yeah, but from what family :P ?
I think those large Rhamphorhynchoids would be one of those predators hunting Anurognathids.
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Even
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Pterodactyloids too in some settings..
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heliosphoros
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Modern swallows, nightjars and insectivorous bats fall prey to a lot of predators, many of which flightless, which take them out when they sleep, so the same would apply to anurognathids. Plus probably some prehistoric version of the fungal diseases that ravage these animals too.
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CyborgIguana
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stargatedalek
Jun 15 2014, 07:29 PM
I still think its plausible for a powered flight exothermic animal besides insects to exist

I just don't think pterosaurs were that animal

I think if pterosaurs were endothermic, that would point towards the ancestors of dinosaurs being endothermic as well
That may not necessarily be the case. I think endothermy in pterosaurs probably evolved simultaneously with powered flight. The same seems to be true of birds. A taxon's metabolism isn't necessarily universal. :P
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CyborgIguana
Jun 17 2014, 11:42 AM
I think endothermy in pterosaurs probably evolved simultaneously with powered flight.
Actually considering crocodilians have four chambered hearts, it's more than likely that archosaurs evolved mesothermy very early on in their evolution. Crocodilians lost their higher metabolism more than likely as they became semiaquatic, as a lower metabolism means that you can sit there doing nothing for a lot longer. :P
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CyborgIguana
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But couldn't pterosaurs and birds have evolved a higher metabolism as their habitats put pressure on them to become more and more physically active and eventually learn to fly?
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stargatedalek
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I'm not slow! That's just my moe!

CyborgIguana
Jun 17 2014, 11:42 AM
stargatedalek
Jun 15 2014, 07:29 PM
I still think its plausible for a powered flight exothermic animal besides insects to exist

I just don't think pterosaurs were that animal

I think if pterosaurs were endothermic, that would point towards the ancestors of dinosaurs being endothermic as well
That may not necessarily be the case. I think endothermy in pterosaurs probably evolved simultaneously with powered flight. The same seems to be true of birds. A taxon's metabolism isn't necessarily universal. :P
Wouldn't that mean no dinosaurs were endothermic? xD
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CyborgIguana
Jun 17 2014, 12:05 PM
But couldn't pterosaurs and birds have evolved a higher metabolism as their habitats put pressure on them to become more and more physically active and eventually learn to fly?
More than likely that's why birds (and probably pterosaurs) evolved higher metabolisms, yes. :)
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I think the non avian dinosaurs closest related to birds, like maniraptorans, have higher metabolisms than say Apatosaurus.
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