# Hedgehog Region: Europe Source: https://spinplanet.app/animals/en/hedgehog/ The hedgehog is a small, cute animal with thousands of sharp spines on its back. When it senses danger, it rolls into a ball and hides behind its prickly armor. It's nocturnal and comes out at night to look for bugs. ## Quick facts - **Habitat**: It lives in Europe's woods, fields, and gardens. - **Diet**: It eats insects, earthworms, and snails. - **Size and weight**: Length 20–30cm, weight 0.6–1.2kg. - **Lifespan**: 3–7 years - **Conservation status**: Least Concern - **Fun facts**: It has more than 5,000 spines on its back! / When winter comes, it curls up into a ball and hibernates. ## Learn more ### The little explorer of the forest, dressed in a prickly suit of armor The amazing secrets of the hedgehog that we never knew - A mysterious mammal with over 5,000 spines. - It's mostly active at night, helping protect the forest ecosystem. - Let's discover the fun biological traits hidden behind its cute looks. ### 5,000 perfect shields Its spines are actually a remarkable tool, evolved from fur. - Its entire back is covered with 5,000–7,000 densely packed spines. - Made of the same keratin as human fingernails, they're hollow inside and very light. - Just as baby teeth fall out, it naturally sheds and regrows spines as it grows, a process called 'quilling.' ### Transforming into a spiky ball in an instant A perfect, impenetrable defense system using special muscles 1. When it senses danger, it instantly hides its soft parts, like its head and belly. 2. Special muscles beneath the skin (piloerector muscles) contract, making the spines stand straight up at 90 degrees. 3. Its hollow spines also act like an airbag, absorbing shock when it falls from a height. ### A superpower that even beats snake venom A special ability that lets it survive in the rough wild despite its small size - Thanks to a protein called 'erinacin' in its muscles, it has natural immunity to snake venom. - When it smells something unfamiliar, it froths at the mouth and spreads the foam onto its spines, a behavior called 'anointing.' - This unique behavior is a great survival skill, letting it camouflage itself with the scent of its surroundings. ### A scent detective ruling the night Its eyesight is weak, but its sense of smell and hearing are remarkable. - Its excellent sense of smell lets it pinpoint prey hidden under dark fallen leaves. - It can detect even the faintest sounds, sensing danger and locating food nearby. - Eating mainly caterpillars, earthworms, and spiders, it acts as a helpful pest-control cleaner for the ecosystem. ### The biological magic of hibernation It completely shuts down its body's switches to endure the cold winter. - **Body temperature shift** — from a normal 35°C down to under 10°C during hibernation. - **Heart rate shift** — from a normal 190 beats a minute down to just 20 during hibernation. - **Breathing shift** — to conserve energy to the extreme, it breathes only once every few minutes. ### A little wild animal in your room The essential environment needed to keep one as a pet - Since it's very vulnerable to hypothermia, it must always be kept warm at 24–28°C. - Since it naturally prefers to live alone, only one should be kept per cage. - Being nocturnal, it's extremely active every night, so a safe wheel at least 28cm across is essential. ### The hedgehog's dilemma The heartwarming gap between a famous philosophical metaphor and real biology - This is philosopher Schopenhauer's famous metaphor for keeping a proper distance between people. - The story goes that hedgehogs huddle together to escape the cold, but their spines make it hard to get close. - In reality, however, hedgehogs are affectionate animals that can lay their spines flat and embrace each other without getting hurt. ## More animals from this region - [Brown Bear](https://spinplanet.app/animals/en/brownbear/) - [Eurasian Lynx](https://spinplanet.app/animals/en/lynx/) - [Reindeer](https://spinplanet.app/animals/en/reindeer/) - [European Bison](https://spinplanet.app/animals/en/wisent/) - [White Stork](https://spinplanet.app/animals/en/stork/) - [Red Fox](https://spinplanet.app/animals/en/redfox/) --- All images and videos were made with AI to capture each animal's features, so they may look different from the real animals. The animal information comes from public sources and may contain mistakes.