Herodotus casually mentions that there were snakes that would fly from Egypt every year from the Sinai wilderness (Herodotus 2.75-76). This may strike fear in the heart of any snake-fearing person, but it sure is interesting. Marco Polo would also write in his travel log about flying venomous “birds” as well as snakes of gigantic proportions as he explored Asia. 
The Bible records several strange serpents and one passage in particular is especially fascinating.