Plus, a rat isn't mostly grown until a year old, and even then, it continues to grow thereafter, albeit slowly. However, wild rats usually don't live more than 9 months, on average, so don't grow as big as domestic rats. read more
Much-larger Gambian pouched rats have been found in the Big Apple, likely released as pets, Combs said, but he doubts there are breeding populations of them. He also offered some reassuring information about the larger of the regular NYC rats. read more