Quills have sharp tips and overlapping scales or barbs that make them difficult to remove once they are stuck in another animalâs skin. Porcupines grow new quills to replace the ones they lose. From the tip of the nose to the end of the tail, a porcupine can be from 33 to 46 inches (80 to 115 cm) long. They can weigh from 12 to 35 lbs (5 to 16 kg). Porcupines make shrill screeches, whines, and low grunts to communicate. Porcupines are nocturnal, which means they are active primarily at night.
1 Wood pellets at $250/ton cost about $18 per million BTU, which is a savings of $25 per MBTU vs. heating oil at $2.91/gallon.  That means for every ton of wood pellets you use, youâll save approximately $100 per ton, even before the additional savings possible through efficiency gains.
Ammonium nitrate (34-0-0), in comparison, at $525 per ton Ã· 680 pounds actual nitrogen per ton costs 77 cents per pound actual nitrogen. In our example, the urea appears to cost 19 percent more when priced by the ton, but actually costs 12 percent less when priced by pound of actual nitrogen.or the comparison to be fair, evaluate each type of fertilizer on a cost per pound of actual nitrogen basis. Calculate the cost per pound of nitrogen with the following formula: fertilizer cost per ton Ã· pounds actual nitrogen per ton = cost per pound of nitrogen.