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Nobletripe, is a user of the English wikipedia. I have been a user since 4 March, 2011. As this is my user page, I will not be too kind to those who vandalise it, nor will I be too happy if anyone edits my user page without first mentioning it on my talk page. If you wish to change something, please mention it here first. We'll try and come to some sort of an agreement,okay? I hover around a bit, and if I have any information on a topic to add, I will add it. If I find a topic that has no article, and I can find enough information about the said topic, I will create it.
Sea urchins are a group of spiny globular echinoderms which form the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 feet; 2,700 fathoms). Their tests (hard shells) are round and spiny, typically from 3 to 10 centimetres (1 to 4 inches) across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea otters, starfish, wolf eels, and triggerfish. This photograph, taken off the northern coast of Haiti near Cap-Haïtien, shows two species of sea urchin: a West Indian sea egg(top) and a reef urchin(bottom).Photograph credit: Nick Hobgood, edited by Lycaon
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