Alligators and crocodiles have much in common; the differences, if any, are minor. First of all, both alligators and crocodiles have the same reptile appearance. Looking like huge lizards, they bask in the sun dl day long and hunt in the rivers, swamps and marshes of tropical areas at night. Both have long thin bodies with squat legs, webbed feet and strong tails. They also have thick hides that have

commercial value. Both are dangerous to human beings. The alligator differs from the crocodile in that its snout is much broader and a little shorter. Also the fourth tooth of an alligator fits into a different place in the upper jaw. In general crocodiles are more active and more dangerous.

(from Susan S. Johnston et a1 : Keys to Composition)

Question: Are any other techniques of development used here?