Particularly romantic

A North American porcupine female is fertile once a year. Males fight each other to determine who gets to mate with the female. They bite each other and use their spines. The male who has won then does something very special. He urinates all over the female. With this he lets everyone know that this female is his.

Cozy

Generally, the North American arboreal porcupine lives alone. They sleep in burrows under a rock or in a hollow tree. In winter, tree-stick pigs seek each other out. They then share a burrow and lie warm against each other. Old-world porcupines do not hibernate. If it is very cold they do stay in the burrow until the weather improves.