A peck refers to a formation of a bird flock, these flocks fly in a V formation to complete a V formation you need three birds to make the initial shape it requires an addition of two extra birds.
In conclusion if peter piper picked a peck of pickled peppers he picked 3 or any odd number higher.
Yeppers! I went to Paris, I went to Spain, I have been to New York and I will be going to Japan. And all this I do by simply sitting in a corner? Who am I?