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.
The calculation is 0.46 X 2,000 = 920 pounds of nitrogen in a ton of urea). As an example, urea at $625 per ton Ã· 920 pounds actual nitrogen per ton costs 68 cents per pound 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.