By st20113 
The hedgehog is a small, spiny mammal found across Europe, Asia, and Africa. Belonging to the family Erinaceidae, hedgehogs are celebrated for their coat of sharp defensive spines and their habit of curling into a tight ball when alarmed. As nocturnal foragers, they help control invertebrate populations within their ecosystem.
Physical Characteristics
Hedgehogs measure 14–30 cm long and weigh 300–1,200 grams depending on species. Their backs and sides are covered with up to 5,000 hollow spines made of keratin—the same protein as human hair and nails. When threatened, strong muscles around the skin fold the animal into a sphere, presenting a fortress of points to predators. Their faces are pointed, with small eyes and an excellent sense of smell.
Diet and Foraging
Hedgehogs are primarily insectivorous, eating beetles, worms, caterpillars, and other invertebrates, supplemented by fallen fruit, eggs, and small vertebrates. They forage at night, using hearing and smell to locate prey under leaf litter. Their appetite for garden pests makes them welcome neighbors in many rural and suburban areas.
Hibernation
In colder regions, hedgehogs hibernate through winter, lowering their body temperature and heart rate and living off fat reserves. They build leafy nests in burrows, hedgerows, or log piles. Mild winters and abundant autumn food improve their chances of surviving until spring.
Reproduction and Lifespan
After a gestation of about five weeks, a female bears four to six young born with soft, pink spines that harden within days. The mother raises them alone, and they become independent after a few weeks. In the wild, hedgehogs typically live 2–5 years.
Conservation Status
Several European species, including the western European hedgehog, have declined sharply due to habitat loss, road traffic, and pesticide use that reduces their prey. Garden features such as log piles, ponds with safe edges, and hedgehog highways through fences support local populations. Some species elsewhere remain common.
Hedgehogs are small but vital partners in healthy ecosystems, quietly keeping invertebrate numbers in check. Their decline in parts of Europe is a warning sign for the state of managed landscapes.