When traveling by foot, most birds hop. Some run. A few (of the non-water fowl type anyway) actually walk. Grackles have a stroll that I find quite satisfying. If you're lucky, you'll see one doing a grapevine (that's walking sideways, for those of you who've never seen an aerobics class).
I have to go to work. I'll update with a limerick or something later.
UPDATE: Obligatory poem
Here he is, the bird of the hour
Walking around his piercing eyes glower
His beak is set to make him look dour
As if he has eaten something quite sour
Or heard the phrase "junk bird" from some ivory tower
Rhyming words not used: flower, shower, power, our, wower (as in one who wows). Any others?