The limerick consists of five anapestic lines rhymed aabba. The first, second, and fifth lines are trimeter; the third and fourth lines are dimeter. The form dates back at least to the fourteenth century. In its modern form, it is often, though not always, bawdy.- Category ID : 9633
A limerick page for children, with a simple explanation and some family-friendly examples, including the option to print out limericks in color. Be warned: the site generates pop-up and new-browser-window ads.
A discussion of the form by Joel D. Ash, a writer of serious limericks, with examples of serious limerick poetry, including one of his own. However, beware: the two links to books of and about limericks do not work.