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About David Prus
(Top Expert on this page)

Expertise
I can answer any general questions about dinosaurs and on prehistoric mammals in the Cenozoic. I also know a bit about the media's various depictions of dinosaurs and their inaccuracies. I don't know much about "microfauna"-small animals, or about Paleozoic besides some knowledge about Permian animals. Plants are right out, I'm afraid.

Experience
I have been interested in dinosaurs for most of my life, own a large collection of scientific papers and books on the subject, and am a member of the Field Museum in Chicago.

Education/Credentials
I am in college, but studied biology and geology both in high school and as a personal effort.

   

You are here:  Experts > Science > Archaelogy > Paleontology (Dinosaurs)

SubjectDate AskedExpert

Biggest Prehistoric Parrots??10/30/2009David Prus
  Q: Which is the biggest parrot to go extinct(either historically or prehistorically)?? Thank you.
  A: Extinct parrots are very hard to classify and describe, so little is known about them The largest ...
torosaurus10/24/2009David Prus
  Q: what would your views on this be if you no of this information? generally speeking i have seen the ...
  A: The scientific community is rightly skeptical about the Torosaurus=Triceratops idea. They're very ...
biology10/21/2009David Prus
  Q: i need help making a cladogram using slugs catfish frog tiger and a human. i have to tell if ...
  A: This is more of a biology question, but it's fairly simple Slugs-cells Catfish-cells, backbone ...
videos10/18/2009David Prus
  Q: these do exist but are rare and they would show the displays in a musuem or exhibition. if you know ...
  A: I'm afraid I don't know of any such videos. I have only seen displays in assorted documentaries ...
bite force10/10/2009David Prus
  Q: please ,what is the bite force: marsupial lion ; triceratops ; lion panthera atrox ; bears ...
  A: Thylacoleo-2101 Newtons Triceratops-Unknown, but likely to be very high American Lion-Between 1000 ...
oldest horse?9/13/2009David Prus
  Q: What is the oldest ancestor of horses?
  A: Well, it depends on you definition. The Oldest member of the genus Equus is E. stenonis from Italy, ...
Dinosaur habitat9/7/2009David Prus
  Q: I am fascinated in paleontology and particularly in how prehistoric animals could cope in the modern ...
  A: Some of the dinosaurs could have. The small ornithopods and theropods in the Cretaceous period were ...
Largest therapsid8/30/2009David Prus
  Q: What is the largest therapsid ever?
  A: I've been asked this question before, and it's a good one, considering how little the public is ...
oldest duck?8/20/2009David Prus
  Q: What is the oldest ancestor of ducks?
  A: The earliest Anatid (true duck) is Eonessa from the Eocene of the Western United States. The ...
Evolution8/15/2009David Prus
  Q: Is there any reasons that proove evolution is there any reasons that disproove evolution also i was ...
  A: Evidence for : http://www.talkorigins.org/faqs/comdesc/ Evidence against: ...
Dinosaurs8/11/2009David Prus
  Q: David i wish you are fine,I want to ask you something important about dinosaurs.what is the main ...
  A: Nadia It's very hard to tell what exactly caused the dinosaurs' extinction. It was probably a ...
largest8/10/2009David Prus
  Q: hy-how long is the largest and longest dinosaur eggs? i did find some photos online that state the ...
  A: The largest dinosaur eggs were of Chinese titanosaurs, about a foot in length. The "1 metre" ...
birds vs people8/8/2009David Prus
  Q: I have a basic understanding of the theory of evolution but there is one question I can not seem to ...
  A: Good question. I think part of it is the fact that birds specialized their arms (in addition to ...
Dinosaurs and Ratites8/4/2009David Prus
  Q: My query concerns perceived versus true taxonomic differences and whether distinction between two ...
  A: Good question. Often there's quite a bit of overlap, and derived characteristics may obscure ...
Modern Relatives7/25/2009David Prus
  Q: 1)Do you have information on the closest living relatives of the following prehistoric animals?? ...
  A: 1) Panthera atrox's relative is the Gir Forest Lion Ursus Spelaeus' relative is the Eurasian Brown ...
Keeled sternum in pterosaurs?7/23/2009David Prus
  Q: Hope you don't mind me pestering you with another question! This time it's pterosaurs. I have only ...
  A: Every scientific paper I've ever read reports carinae on pterosaur sternums. I don't understand ...
Weight of Dinosaurs7/22/2009David Prus
  Q: David Prus Can you tell me the weight of these following dinosaurs and marine reptiles that I can't ...
  A: 1. The problem with Tyrannosaurus weight is that it has changed again and again. It was probably ...
Feeding Behavior7/22/2009David Prus
  Q: 1)Can you tell me the feeding technique of the following animals?? Borhyena Helicoprion Anomalocaris ...
  A: 1. Borhyena was an ambush predator, killing with its large canines and feeding with the thick, ...
Question7/21/2009David Prus
  Q: Did Amphicoelias really grow to 200 feet in length?
  A: Not exactly. More like 150 feet based on a reassessment recently. It's hard to tell, considering all ...
Largest organisms7/19/2009David Prus
  Q: 1)Can you tell me the differences between Tremarctinae bears and other sub-families of bears?? 2)Can ...
  A: 1. Tremarctine bears are an American branch of the bear family, with shorter muzzles, wide molars ...
Fossils7/16/2009David Prus
  Q: i know imust be getting annoying asking so many questions 1) i live in Aberdeen (scotland) and i ...
  A: Well, there's a lot of places for Carboniferous and Jurassic marine fossils. Here's some sites on ...
Ammonite7/16/2009David Prus
  Q: i recently got a pyritized ammonite whihc isin a rock the question is how doi polish it because it ...
  A: 'Fraid not. Most radiometric methods require specialized machines like mass spectrometers. You'd ...
Ammonite7/16/2009David Prus
  Q: i recently got a pyritized ammonite whihc isin a rock the question is how doi polish it because it ...
  A: First, try to find out where it came from and how old the rock was. That should narrow it down. ...
Ammonite7/16/2009David Prus
  Q: i recently got a pyritized ammonite whihc isin a rock the question is how doi polish it because it ...
  A: It just means that pyrite was the mineral that "filled in" the fossil. This is rare, considering how ...
Weight of Dinosaurs7/14/2009David Prus
  Q: David Prus Can you tell me the weight of these following dinosaurs and marine reptiles that I can't ...
  A: 1. Brachiosaurus' weight was, according to Christiansen, overestimated in the past and was more ...
Thylacoleo7/13/2009David Prus
  Q: and thank you for your useful answers: If Thylacoleo encountered the following animals, which would ...
  A: Quinkana, Shansisuchus, Pristichampsus and Ornithosuchus seem too big and heavily armed and armored. ...
Questions7/12/2009David Prus
  Q: yeah a few uestiosn 1) how can a long snout of a spinosaurus make it a fish eater 2) what killed the ...
  A: Plenty. Here's some of the more interesting ones: Turtles: Archelon: Giant sea turtle Protostega: ...
Questions7/12/2009David Prus
  Q: yeah a few uestiosn 1) how can a long snout of a spinosaurus make it a fish eater 2) what killed the ...
  A: I might have answered this question before. My answer was: "As for others, there are ...
Questions7/12/2009David Prus
  Q: yeah a few uestiosn 1) how can a long snout of a spinosaurus make it a fish eater 2) what killed the ...
  A: 1) Three things make Spinosaurus a piscivore: The claws are long, hooked, and without a cutting ...
Primitive Dinosaurs7/11/2009David Prus
  Q: and thank you for your useful answers: 1)Can you put these dinosaurs from the most primitive to the ...
  A: 1) Dilophosaurus Ceratosaurus Kryptops Rugops Abelisaurus Proceratosaurus Ornitholestes Guanlong ...
A couple of questions7/9/2009David Prus
  Q: 1) how can scientists say that troodon was the smartest without having the brain or seeing how it ...
  A: 1) Intelligence often depends on the ratio of brain size to body size. Troodon has the largest brain ...
Crocodilians "cold-blooded" as a secondary adaptation?7/9/2009David Prus
  Q: Many thanks for your answer about Ornithosuchus, which makes things much clearer! I knew I had to ...
  A: Thing is, Erythrosuchids were basal but not ancestral to anything. They were ambush predators, but ...
Ornithosuchus as a swimming predator?7/8/2009David Prus
  Q: I'm delighted to have found this site as I have so many questions! I was reading AD Walker's classic ...
  A: Fascinating idea. There are a couple problems; the teeth are curved backwards and the head is short. ...
Amphicyon7/7/2009David Prus
  Q: 1)Which were the probable prey items for Amphicyon?? 2)Can you provide me a pic of the claws of ...
  A: 1)It was widespread across the Northern continents from the USA to China to India to Europe, so ...
Anteosaurus7/6/2009David Prus
  Q: and thank you for your resourcefulness. Who will win between Anteosaurus and these animals?? ...
  A: The Thylacines are smarter and quicker, but they lack the power to defeat an Anteosaur Moschops was ...
Diictodon/Dicynodon7/5/2009David Prus
  Q: Is a Diictodon a Dicynodon? I don't think so, but If they aren't the same creature then is the only ...
  A: Diictodon is a kind of dicynodont. Dicynodon and Diictodon are both dicynodonts. Diictodon are a ...
3 questions7/5/2009David Prus
  Q: (1) what subjects should i study to become a palentogist (2) how should i go about becoming a ...
  A: 1. Depends on the Institution (bigger=higher), credentials (more=higher), and the field (more ...
3 questions7/5/2009David Prus
  Q: (1) what subjects should i study to become a palentogist (2) how should i go about becoming a ...
  A: That's unlikely. While it may have been true for the larger species, there were still a lot of ...
3 questions7/5/2009David Prus
  Q: (1) what subjects should i study to become a palentogist (2) how should i go about becoming a ...
  A: 1) Geology, zoology (biology in general, actually), anatomy, some physics, some chemistry, and ...
who's closer to birds??7/4/2009David Prus
  Q: 1)Can you put these families of dinosaurs from the less bird-like to the most bird-like?? ...
  A: 1) Coelophysidae Abelisauridae Ceratosauridae Megalosauridae Spinosauridae Allosauridae ...

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