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Texas rat snakes begin life out of the egg at just over a foot in length, then grow to be around five feet as adults. They will stay lean throughout their lives. The average Texas rat snake will reach between 10 and 15 years of age. Exceptional individuals may live more than 20 years.
The brown rat is a rather large true murid and can weigh twice as much as a black rat and many times more than a house mouse. The length is commonly in the range of 20 to 25 cm (8 to 10 in), with the tail a further 18 to 25 cm (7 to 10 in), thus being roughly the same length as the body.Adult body weight averages 350 g (12 oz) in males and about 250 g (9 oz) in females.he brown rat can breed throughout the year if conditions are suitable, with a female producing up to five litters a year. The gestation period is only 21 days, and litters can number up to 14, although seven is common.