I mean what is Ctenosaur or a Rachodactylid? Crotalus what?? Why all the scientific names?Well scientific or zoological names of creatures, unlike common names, are universally accepted. For instance people in Hong Kong might call the Chinese alligator by a completely different common name then we would, but with zoological names we all speak the same language. So the universal name for the Chinese alligator, no matter what country your in would be: Alligator sinensis. The key here is Universality.
For instance if you see CROCODYLIA then you should guess that it is the section on crocodiles and alligators. You would be right. And if you are a fan of deinosaurs then you know that the suffix saur, means lizard. So if your looking for lizards then you should pick SAURIA. Snakes would be under SERPENTES for serpents, which is a real simple one too.Of course there are a few stumpers. For instance you'd have to take a guess as to what a MOSASAUR is or a CHELONIAN. And worse yet, trying to figure out what the heck kind of animal is under the RHYNCHOCEPHALIA. Again it's all trial and error from that point. Hopefully by the time you are done looking up one reptile, you will have learned about many others as well.
So go ahead and give it a try. You might come back with more knowledge then you'd expect.