This page shows a list of consecutive quadruplets drawn in Powerball, ordered by frequency.
There is no difference between Goblins and Orcs as far as being different species. They are basically the same. If I had to name one difference it would be that Goblins are a type of Orc that has developed more to tunnels and caves, whereas Orcs I think of more patrolling in open spaces, such as the plains of Gorgoroth.
One of the most interesting differences between crocodiles and alligators is salt glands. Crocodiles tend to have functioning salt glands on their tongues which are only nearly visible while the creatures are basking in the sun on land with their mouths wide open.