For the roller coaster, see Sewer Rat (roller coaster) . The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, brown Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.he brown rat is the species common in England, and best known throughout the world.
1 Yes,you can get pregnant after ovulation. 2  There is a 25% chance of getting pregnant during ovulation,and a 5% chance when not ovulating. 3  The egg does not survive for more than 24 hours after ovulation unless conception has occurred.
fertility specialist. Yes, it's possible to get pregnant during your period. You'd have to have a very short menstrual cycle, which is the time from the first day of one period to the first day of the next period, or a tendency to have long periods. Conception occurs when an egg and sperm meet in a fallopian tube.