Martin Schein, founder of the Animal Behavior Society in 1964, studied the diet of brown rats and came to the conclusion that the most-liked foods of brown rats were (in order) scrambled eggs, macaroni and cheese, and cooked corn kernels. According to Schein, the least-liked foods were raw beets, peaches, and raw celery.
(http://en.wikipedia.org/wiki/Brown_rat#Diet)
Nav jau ne jausmas un atrast arī neko izsmeļošu nevar, bet nez kāpēc liekas, ka Latvijā noteikti populārākas ir pelēkās, nevis melnās žurkas. Latvju pelēkais kā nekā :)