Live Birth. After mating, females are pregnant for about seven months -- usually between 205 and 217 days. Instead of having a litter of several small babies like many mammals do, porcupines have one large baby. A baby weighs about a pound, typically ranging from 14 to 18 ounces. Their quills are soft when they're born, but the quills harden within an hour.
Fuel Cost. The cost of wood pellet fuel is usually given in dollars per ton; the average price of the fuel is typically around $250 per ton. The cost of a cord of wood, the fuel burned by a conventional wood stove, is around $200. The average home uses about 7.3 tons of pellet fuel or 6.5 cords of wood per season.
Match pellets are used for the 10 metre air rifle and 10 metre air pistol disciplines. These 4.5 mm (0.177 in) calibre pellets have wadcutter heads, meaning the front is (nearly) flat, that leave clean round holes in paper targets for easy scoring.ince pellets may be shot through a smoothbore barrel, they are often designed to be inherently stable, much like the Foster slugs used in smoothbore shotguns. The diabolo (or  wasp waist pellet) is the most common design found today.