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.
Getting pregnant (conception) happens when a manâs sperm fertilises a womanâs egg. For some women, this happens quickly, but for others it can take longer. Out of every 100 couples trying for a baby, 80 to 90 will get pregnant within one year. The rest will take longer, or may need help to conceive.