Hedgehogs roll into a ball of projecting spines when threatened, leaving themselves all but invulnerable to any natural predator. Hedgehogs tend to be quite nervous in their temperament, and will generally duck their head down, accompanied by rapid snuffling or snorting. This presents a very prickly forehead to any possible enemies. Adults are about six to eight inches long, depending on how far they're stretching when you measure. As pets go, hedgehogs are generally not cuddly lap-fungus type pets, but if you want something that's a little different, not too big, and definitely adorable, then maybe a hedgehog is for you.
Hedgehogs are also quite low maintenance, and they are nocturnal.
They are small, but not too small. There are only a few things that are essential to keep a pet hedgehog. Hedgehogs tend to be surprisingly energetic, and need the chance to use up some of this energy. In addition, it appears more and more that hedgehogs who have and use wheels live much longer and generally seem not to come down with some of the more common serious ailments, such as Fatty Liver Disease. A proper wheel is more of a necessity than a luxury.