hedgehog

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hedgehog,

Old World insectivorous mammal of the family Erinaceidae.

The spiny hedgehogs are found in Africa and Eurasia, except SE Asia. They have rounded bodies up to 13 in. (33 cm) long, very short tails, and pointed snouts; their backs and sides are covered with stiff spines and their undersides with coarse hair. They are usually brown and yellow in color. When frightened, a hedgehog rolls itself into a tight ball with its spines pointing outward; when rolled up it is invulnerable to almost any predator.

The European hedgehog, Erinaceus europaeus, is about 9 in. (23 cm) long, with small ears. It is strictly nocturnal, spending the day in a burrow in the undergrowth; it hibernates in midwinter. The name hedgehog describes the tendency of these animals to make their burrows in the hedgerows that surround English fields.

Hedgehogs are not related to hogs, but they root in the ground for food in the manner of hogs. Their diet consists of small animals, including worms, insects, frogs, mice, and even poisonous snakes; they have a high level of immunity to viper venom. A hedgehog will bite a snake and then roll itself up as the snake strikes, repeating this procedure until the snake is dead.

E. europaeus is found throughout Europe and N Asia, as far north as the limits of the deciduous forest. Other spiny hedgehog species are found in Africa and Asia; many are desert dwellers. Some are wholly nocturnal and others only partially so; all either hibernate or aestivate and tend to hole up during dry weather. Some species have large pointed ears like those of dogs.

The hairy hedgehogs, or gymnures, are found instead of spiny hedgehogs in SE Asia. They resemble long-snouted rats and have coarse bristles but no spines. They give off a distinctive musky odor, produced by anal glands. The largest of the gymnures is the moon rat, Echinosorex gymnurus, with a 15-in. long (38-cm) body and an 8-in. (20-cm) tail.

There are no New World hedgehogs, although the North American porcupineporcupine,
member of either of two rodent families, characterized by having some of its hairs modified as bristles, spines, or quills. The quills are loosely attached to the porcupines' skin and pull out easily, remaining imbedded in any predator that comes in contact with them.
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, which is not an insectivore but a rodent, is sometimes erroneously called a hedgehog. The spines of hedgehogs differ from those of porcupines; they are not barbed and do not pull out of the animal's skin easily.

Both spiny and hairy hedgehogs are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Mammalia, order Erinaceomorpha, family Erinaceidae.

hedgehog

[′hej‚häg]
(ordnance)
A portable obstacle, made of crossed poles laced with barbed wire, in the general shape of an hourglass.
A beach obstacle, usually made of steel bars or channel iron, imbedded in concrete and used to interfere with beach landings.
A concentration of troops securely entrenched or fortified, with arms and defenses facing all directions.
(vertebrate zoology)
The common name for members of the insectivorous family Erinaceidae characterized by spines on their back and sides.

hedgehog

attribute of gourmandism personified. [Animal Symbolism: Hall, 146]

hedgehog

1. any small nocturnal Old World mammal of the genus Erinaceus, such as E. europaeus, and related genera, having a protective covering of spines on the back: family Erinaceidae, order Insectivora (insectivores)
2. any other insectivores of the family Erinaceidae, such as the moon rat
3. US any of various other spiny animals, esp the porcupine
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During the last year, SARA has re-homed 160 dogs, 235 cats, 14 rabbits, two guinea pigs and two hedge hogs.