From Longman Dictionary of Contemporary Englishldoce_152_ahedgehoghedge‧hog /ˈhedʒhɒɡ $ -hɑːɡ, -hɒːɡ/ noun [countable] 
HBAa small brown European animal whose body is round and covered with sharp needle-like spines
HBAa small brown European animal whose body is round and covered with sharp needle-like spinesExamples from the Corpus
hedgehog• A hedgehog tries to climb up the net and when it hears you approach it promptly rolls up into a ball.• I wanted to see a baby hedgehog.• Baby hedgehogs do not have the spines that so readily identify their parents, but these soon start to grow.• The only good thing about his rude awakening was the discovery of a gigantic hedgehog behind one of the goalposts.• And when both the flamingo and the hedgehog were ready, there was no hoop!• But by then, the hedgehog was tired of waiting and was walking away across the croquet-ground.• Spidery legs, rat eyes, whiffling whiskers: an unearthed hedgehog, part of the general exodus due to building developments nearby.• Seeing him towering over the young hedgehog like that, licking his great, greedy chops ... Oh! 