Erinaceus

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Erinaceus is a genus of European hedgehog from the family of Erinaceidae. There are four main species of Erinaceus. The range is all across Europe, throughout the Middle East, parts of Russia, and extending to northern China. Some of the European hedgehogs have been introduced to New Zealand.[2][3]

Description

Erinaceus is like all hedgehogs in that the major physical characteristic is the spines. These spines are a modification of the hair that is formed and strengthened by keratin. The spines contain hollow air filled gaps separated by thin inner layers of the spine to lessen the weight load.[4] Every spine is tapered at the end to form a point and also at the base where it then forms a bulb that is attached to the skin. The tapering at the base allows the spine to have a section that will bend under stress and dampen forces placed on the spines. Each of the spines has a dermal muscle that erects the spine for defense.[4] The size of Erinaceus is 20–30 cm with a weight of 400–1200 g.[5]

Behavior

Like all other hedgehogs Erinaceus is nocturnal and seeks shelter in shrubs and burrows during the day.[6] The common defense mechanism is to roll into a ball with the spines facing outward. The action is done because of excess loose skin on the back of hedgehogs allows them to pull it around the rest of their body forming a ball. The first step is to pull skin fold over the head and rear of the body. Once this is done a muscle that runs along the edges of the animal called the panniculus carnosus contracts pulling everything in like a drawstring.[4] Like most hedgehogs Erinaceus is solitary until breeding season. Another normal action is self-anointing where the organism produces thick foamy saliva and proceeds to cover its spines with the saliva. This could be in response to a chemical signal and often is done when a new object is introduced. The reason for self-anointing is unknown and believed to be either part of a defense or attraction of a mate.[2] Hibernation is common in each of the species for Erinaceus. Most have the ability to lower the body temperature close that of the environmental temperature. In particular Erinaceus europaeus the body temperature can drop down to 1 °C and lower its heart rate down to 22 beats per minute.[4]

Reproduction and lifespan

It is believed that Erinaceus is polygynous in mating. Once fertilized gestation is between 30–40 days. Upon birth the young are born blind and dependent to their mother. The average liter size is 2–5 offspring with a maximum of 10. Offspring are born without developed spines, which form within a few weeks. Weaning occurs around 4–6 weeks. Sexual maturity is reached around 12 months. The average life span is 2–5 years while in captivity lifespan can reach as much as 10 years.[4]

Diet

Erinaceus is an omnivore. It will eat small invertebrates, small vertebrates, fruit, vegetables, and even fungi. In some cases they have been known to eat venomous snakes or even toxic beetles. Some species show resistance to snake venom up to forty times greater than that of the ordinary laboratory mouse.[2][4]

Species

References

  1. ↑ Hutterer, R. (2005). Wilson, D.E.; Reeder, D.M., eds. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 213–214. ISBN 978-0-8018-8221-0. OCLC 62265494.
  2. 1 2 3 Macdonald, David W. The Encyclopedia of Mammals. New York, NY: Facts on File, 1984 ISBN 0871968711.
  3. ↑ Bogdanov, AS; Bannikova, AA; Pirusskiĭ, IuM; Formozov, NA (2009). "The first genetic evidence of hybridization between west European and northern white-breasted hedgehogs (Erinaceus europaeus and E. Roumanicus) in Moscow Region". Izvestiia Akademii nauk. Seriia biologicheskaia / Rossiiskaia akademiia nauk (6): 760–5. PMID 20143638.
  4. 1 2 3 4 5 6 Grzimek, Bernhard, Neil Schlager, Donna Olendorf, and Melissa C. McDade. Grzimek's Animal Life Encyclopedia. Vol. 13. Detroit: Thomson Gale, 2004.
  5. ↑ Lal, S. S. Practical Zoology Vertebrate. Meerut, IN: Global Media, 2010.
  6. ↑ Qumsiyeh, Mazin B. Mammals of the Holy Land. Lubbock: Texas Tech UP, 1996 ISBN 089672364X.
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