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.
1 Mywoodpelletsolution.com offers a wood pellet heating system that starts at $4,995 for the system alone. 2  They note that the average installation job is around $1,000 to start. 3  According to MaineBiz.biz, the average boiler in the state of Maine cost an average of $19,000 for a system. However, with most jobs, the average installation, in addition to buying the boiler, can cost as much as $5,000 to $8,500. 2  While optional, a wood pellet bulk bin is ideal if you would like a place to store a large supply of pellets. 3  These bins can automatically feed pellets into the boiler.