Hedgehog facts for kids
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- For the fictional character, see Sonic the Hedgehog
A hedgehog, also called a hedgepig and furze-pig, is a small mammal. It has spines on its back. When attacked or threatened, it curls up. Hedgehogs eat insects, snails, frogs and toads, snakes, bird eggs, carrion, mushrooms, berries, melons and watermelons. Sometimes, hedgehogs will search for earthworms, after rainstorms.
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Etymology
The name hedgehog came into use around the year 1450, derived from the Middle English heyghoge, from heyg, hegge ("hedge"), because it often hides in hedgerows, and hoge, hogge ("hog"), from its piglike snout. Other names include urchin, hedgepig and furze-pig.
Habitat
There are seventeen species of hedgehog in five genera found throughout parts of Europe, Asia, and Africa, and in New Zealand by introduction.
They live in a range of different habitats such as deserts, forests, meadows and grasslands. They can also live in people's backyards.
Physical description
Hedgehogs are easily recognized by their spines, which are hollow hairs made stiff with keratin. Their spines are not poisonous or barbed and unlike the quills of a porcupine, do not easily detach from their bodies. However, the immature animal's spines normally fall out as they are replaced with adult spines. This is called "quilling". Spines can also shed when the animal is diseased or under extreme stress.
A defense that all species of hedgehogs possess is the ability to roll into a tight ball, causing all of the spines to point outwards. The hedgehog's back contains two large muscles that control the position of the quills. When the creature is rolled into a ball, the quills on the back protect the tucked face, feet, and belly, which are not quilled. Since the effectiveness of this strategy depends on the number of spines. Some desert hedgehogs, who evolved to carry less weight, are more likely to flee or even attack, ramming an intruder with the spines; rolling into a spiny ball for those species is a last resort.
Behavior
Hedgehogs are primarily nocturnal, though some species can also be active during the day. Hedgehogs sleep for a large portion of the day under bushes, grasses, rocks, or most commonly in dens dug in the ground, with varying habits among the species. All wild hedgehogs can hibernate, though not all do, depending on temperature, species, and abundance of food.
Hedgehogs are fairly vocal and communicate through a combination of grunts, snuffles and/or squeals, depending on species.
Self-anointing
Hedgehogs occasionally perform a ritual called anointing. When the animal encounters a new scent, it will lick and bite the source, then form a scented froth in its mouth and paste it on its spines with its tongue. The purpose of this habit is unknown, but some experts believe anointing camouflages the hedgehog with the new scent of the area and provides a possible poison or source of infection to predators poked by their spines. Anointing is sometimes also called anting because of a similar behavior in birds.
Diet
Hedgehogs are omnivorous. They feed on insects, snails, frogs and toads, snakes, bird eggs, carrion, mushrooms, grass roots, berries, melons and watermelons. Berries constitute a major part of an Afghan hedgehog's diet in early spring after hibernation.
Predators
The various species are prey to different predators: while forest hedgehogs are prey primarily to birds (especially owls) and ferrets, smaller species like the long-eared hedgehog are prey to foxes, wolves, and mongooses.
In Britain, the main predator is the badger.
Reproduction and lifespan
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Hedgehogs have a relatively long lifespan for their size. Larger species of hedgehogs live 4–7 years in the wild (some have been recorded up to 16 years), and smaller species live 2–4 years (4–7 in captivity), compared to a mouse at 2 years and a large rat at 3–5 years. Lack of predators and controlled diet contribute to a longer lifespan in captivity (8–10 years depending on size).
The average litter is 3–4 newborns for larger species and 5–6 for smaller ones. Hedgehogs are born blind with a protective membrane covering their quills, which dries and shrinks over the next several hours. The quills emerge through the skin after they have been cleaned, or it falls off.
Domestication
The most common pet species of hedgehog are hybrids of the white-bellied hedgehog or four-toed hedgehog (Atelerix albiventris) and the North African hedgehog (A. algirus). It is smaller than the European hedgehog, and thus is sometimes called the African pygmy hedgehog. Other species kept as pets are the long-eared hedgehog (Hemiechinus auritus) and the Indian long-eared hedgehog (H. collaris).
It is illegal to own a hedgehog as a pet in some US states including Hawaii, Georgia, Pennsylvania, and California, and some Canadian municipalities, and breeding licenses are required. No such restrictions exist in most European countries with the exception of Scandinavia. In Italy, it is illegal to keep wild hedgehogs as pets.
Invasive species
In areas where hedgehogs have been introduced, such as New Zealand and the islands of Scotland, the hedgehog has become a pest. In New Zealand it causes immense damage to native species including insects, snails, lizards and ground-nesting birds, particularly shore birds. As with many introduced animals, it lacks natural predators.
Eradication can be troublesome. Attempts to eliminate hedgehogs from bird colonies on the Scottish islands of North Uist and Benbecula in the Outer Hebrides were met with international outrage.
Human influence
As with most small mammals living around humans, cars pose a great threat to hedgehogs. Many are run over as they attempt to cross roadways.
Culinary and medicinal use
Hedgehogs are a food source in many cultures. Hedgehogs were eaten in Ancient Egypt and some recipes of the Late Middle Ages call for hedgehog meat. Hedgehogs are traded throughout Eurasia and Africa for traditional medicine and witchcraft.
In popular culture
Sir Richard Onslow (1601–64), parliamentarian, compared King Charles I of England to a hedgehog.
The title character in Beatrix Potter's 1905 children's story The Tale of Mrs. Tiggy-Winkle is a hedgehog.
E. Nesbit wrote a fantasy short story entitled "The Princess and the Hedge-pig" (collected in The Magic World, 1912), in which a prince is under an enchantment, and his transformation into a hedgehog allows a curious prophecy to come true.
Philip Larkin, who turned down Poet Laureate-ship and is the late 20th century's best-known English poet, wrote one of his most quoted poems on the death of a hedgehog, "The Mower".
Sonic the Hedgehog, first introduced in 1991, is a blue anthropomorphic hedgehog and the title character of numerous video games, comic strips, and animated cartoons by Sega.
Interesting facts about hedgehogs
- There are no hedgehogs native to Australia and no living species native to the Americas.
- Hedgehogs have some natural immunity against some snake venom through the protein erinacin in the animal's muscular system, although it is only available in small amounts and a viper bite may still be fatal.
- During hibernation, the body temperature of a hedgehog can decrease to about 2 °C (36 °F). When the animal awakes from hibernation, the body temperature rises from 2–5 °C (36–41 °F) back to its normal 30–35 °C (86–95 °F) body temperature.
- In 2006, McDonald's changed the design of their McFlurry containers to be more hedgehog-friendly. Previously, hedgehogs would get their heads stuck in the container as they tried to lick the remaining food from inside the cup. Then, being unable to get out, they would starve to death.
- Domesticated hedgehogs sometimes get their head stuck in tubes (commonly, lavatory paper tubes) and walk around with the tube on their head. Hedgehog owners often refer to this as "tubing" and promote the behavior by supplying clean tubes. Most owners are considerate enough, however, to cut the tubes lengthwise so as to prevent the hedgehog from remaining trapped against their will.
- In the Middle East and especially among Bedouins, hedgehog meat is considered medicinal, and thought to cure rheumatism and arthritis.
Genera and species
Subfamily Erinaceinae (hedgehogs)
- Genus Atelerix
- Four-toed hedgehog, Atelerix albiventris
- North African hedgehog, Atelerix algirus
- Southern African hedgehog, Atelerix frontalis
- Somali hedgehog, Atelerix sclateri
- Genus Erinaceus
- Amur hedgehog, Erinaceus amurensis
- Southern white-breasted hedgehog, Erinaceus concolor
- European hedgehog, Erinaceus europaeus
- Northern white-breasted hedgehog, Erinaceus roumanicus
- Genus Hemiechinus
- Long-eared hedgehog, Hemiechinus auritus
- Indian long-eared hedgehog, Hemiechinus collaris
- Genus Mesechinus
- Daurian hedgehog, Mesechinus dauuricus
- Hugh's hedgehog, Mesechinus hughi
- Small-toothed forest hedgehog, Mesechinus miodon
- Gaoligong forest hedgehog, Mesechinus wangi
- Genus Paraechinus
- Desert hedgehog, Paraechinus aethiopicus
- Brandt's hedgehog, Paraechinus hypomelas
- Indian hedgehog, Paraechinus micropus
- Bare-bellied hedgehog, Paraechinus nudiventris
Images for kids
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A hedgehog that feels threatened can roll into a tight ball.
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Hedgehog suffering from balloon syndrome before deflating
See also
In Spanish: Erizo para niños
