Science Fair Project Encyclopedia
- For the anti-submarine weapon see Hedgehog (weapon); for the mathematical concepts see hedgehog (curve) and hedgehog (metric) .
Mesechinus A hedgehog is any of a wide variety of small quilled mammals of the order Insectivora found through parts of Europe, Asia, Africa, and New Zealand. There are no hedgehogs native to The Americas.
Hedgehogs are easily distinguished by their quills, which are hollow hairs made stiff with keratin. Their quills are not poisonous or barbed and, unlike the quills of a porcupine, cannot easily be removed from the animal.
A hedgehog's primary defense is to roll into a tight ball, causing all of the quills to protrude outward. They also make loud huffing and popping noises. This is an effective defense against most predators. As a result, hedgehogs have few natural predators, primarily birds (especially owls), and ferrets. Wild hedgehogs are sometimes killed by humans, particularly by road vehicles.
Hedgehogs occasionally perform a ritual called 'anointing'. When the animal comes across a new scent, it will lick and bite the source and then form a scented froth in its mouth and paste it on its quills with its tongue. This camouflages the hedgehog with the new scent of the area and provides a possible poison or source of infection to any predator that gets poked by their quills.
Hedgehogs are primarily nocturnal and feed on snails, worms, and insects. In areas that have hedgehogs in the wild, they are often welcome as a natural form of garden pest control. Many people leave food out to attract hedgehogs. However, hedgehogs are lactose intolerant and will eagerly eat cheese products and drink milk, making themselves sick. Dog and cat food is a better food than dairy, but it is often too high in fat and too low in protein. It is best to leave out only a small treat, leaving them plenty of appetite for the pests in your garden.
Depending on the species, the gestation period is 40-58 days. The average litter is 3-4 newborns. Larger species of hedgehogs live 4-7 years in the wild (some have been recorded up to 16 years). Smaller species live 2-4 years (4-7 in captivity).
- Main article: European Hedgehog
Unlike the smaller, warmer climate species, the European Hedgehog may hibernate in the winter and possibly spring.
The most common pet species of hedgehog is actually hybrid of the White-Bellied or Four-Toed Hedgehog (Atelerix albiventris) and the Algerian Hedgehog (A. algirus). It is smaller than the European Hedgehog, and thus is sometimes called African Pygmy Hedgehog. Other species kept as pets are the Egyptian long eared hedgehog (Hemiechinus auritus auritus) and the Indian long eared hedgehog (Hemiechinus collaris).
All three species prefer a warm climate (above 72 degrees Fahrenheit) and do not hibernate. Attempts to hibernate are commonly fatal. They eat a diet of mainly catfood, ferret food and insects.
It is illegal to own a hedgehog as a pet some US states, and you do need a license to breed them. No such restrictions exist in Europe. If you are in the US, check with animal control before considering having a hedgehog as a pet.
Hedgehogs are a powerful form of pest control. A single hedgehog can keep an average garden pest free by eating up to 200 grams of insects each night. Therefore, it is common throughout England to see people attempting to lure hedgehogs into their yards with treats and hedgehog-sized holes in their fences.
One problem with using hedgehogs for garden pest control is the use of chemical insecticide. While the hedgehog is immune to most poisons, it is not immune to them when ingesting insects full of the poison. This causes many hedgehog deaths where pet hedgehogs eat contaminated bugs inside the house.
In areas where hedgehogs have been introduced, such as New Zealand and the islands of Scotland, the hedgehog itself has become a pest. As with many introduced animals, it lacks natural predators. With overpopulation, it kills off more insects than initially intended and expands its diet to include things such as snails, worms, and the eggs of wading birds.
There are many diseases common to hedgehogs, mostly fatal. These include cancer, fatty liver disease, heart disease, and wobbly hedgehog syndrome.
Cancer is very common in hedgehogs. The most common is squamous cell carcinoma. Squamous cell spreads quickly from the bone to the organs in hedgehogs, unlike in humans. Surgery to remove the tumors is rare because it would result in removing too much bone structure.
Fatty liver disease is believed by many to be caused by bad diet. Hedgehogs will eagerly eat foods that are high in fat and sugar. Having a metabolism designed for low-fat, protein-rich insects, this leads to common problems of obesity. Fatty liver disease is one sign, heart disease is another.
Wobbly hedgehog syndrome is very similar to multiple sclerosis in humans. The hedgehog slowly loses muscle control. Initially, it wobbles when attempting to stand still. Given time, the hedgehog loses all muscle control, including control of the lungs and heart. Vitamin E has been shown to delay the deterioration, but it is very temporary as a higher and higher dose is required.
The common American holiday Groundhog Day was started in ancient Rome as Hedgehog Day and is still celebrated as such through much of the world. There are no native hedgehogs in America, so the early settlers chose the groundhog as a substitute.
List of 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 (Woodland hedgehogs)
- Amur Hedgehog (Erinaceus amurensis)
- Eastern European Hedgehog (Erinaceus concolor)
- Western European Hedgehog (Erinaceus europaeus)
- Genus Hemiechinus (Steppe hedgehogs, Desert hedgehogs)
- Desert Hedgehog (Hemiechinus aethiopicus)
- Long-eared Hedgehog (Hemiechinus auritus)
- Indian Long-eared Hedgehog (Hemiechinus collaris)
- Brandt's Hedgehog (Hemiechinus hypomelas)
- Indian Hedgehog (Hemiechinus micropus)
- Bare-bellied Hedgehog (Hemiechinus nudiventris)
- Genus Mesechinus (Steppe hedgehogs)
- Daurian Hedgehog (Mesechinus dauuricus)
- Hugh's Hedgehog (Mesechinus hughi)
- DMOZ Hedgehogs
- Finnish Hedgehog Association
- Hedgehog Central
- Hedgehog reference at the University of Michigan Museum of Zoology
- Hedgehog Welfare Society
- Hedgehog World
- The International Hedgehog Association
- The International Hedgehog Registry
- USENET Hedgehog FAQ
(May also contain hedgehog information)
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