LETTER from TERRY BERKSON The Jumping Chicken Of Otsego County Terry Berkson, who has an MFA in creative writing from Brooklyn College, lives on a farm outside Richfield Springs. His articles have appeared in New York magazine, the New York Daily News Sunday Magazine, Automobile and other publications. Got a call the other day from my friend Charlie in Brooklyn. He said that he was thinking of getting a couple of chickens to keep in his apartment so that he…