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.
Early Signs of Conception. If you are trying to get pregnant, you may wonder whether you will feel different or notice any early symptoms right after conception. Conception takes place in the fallopian tubes shortly after you ovulate. It takes about 24 hours for a sperm to fertilize the egg.