These rats, probably Norway rats (see link), are active during the day, unlike most rats, which are nocturnal. The rat that interested me was the rat with the white blotch. Domesticated animals such as horses, cows, dogs, and now foxes often show blotchy coats, whereas, as far as I know, wild animals do not. The blotched rat, then, is probably a feral rat or a descendant of a feral rat that bred with a wild rat. Is that right? Did someone irresponsibly release a domesticated rat into the neighborhood?