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1.0Animal Facts For Kids | Wild Factshttp://www.wild-facts.comNathanhttp://www.wild-facts.com/author/wildfac1/rich600338<blockquote class="wp-embedded-content" data-secret="g25pSxcNeB"><a href="http://www.wild-facts.com/2011/wild-fact-629-extinction-forget-about-it-horseshoe-crab/">Wild Fact #629 – Extinction? Forget About It! – Horseshoe Crab</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="http://www.wild-facts.com/2011/wild-fact-629-extinction-forget-about-it-horseshoe-crab/embed/#?secret=g25pSxcNeB" width="600" height="338" title="“Wild Fact #629 – Extinction? Forget About It! – Horseshoe Crab” — Animal Facts For Kids | Wild Facts" data-secret="g25pSxcNeB" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /*! This file is auto-generated */ !function(c,d){"use strict";var e=!1,o=!1;if(d.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},c.wp.receiveEmbedMessage);else if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(!t);else if(!(t.secret||t.message||t.value));else if(/[^a-zA-Z0-9]/.test(t.secret));else{for(var r,s,a,i=d.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),n=d.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),o=new RegExp("^https?:$","i"),l=0;l<n.length;l++)n[l].style.display="none";for(l=0;l<i.length;l++)if(r=i[l],e.source!==r.contentWindow);else{if(r.removeAttribute("style"),"height"===t.message){if(1e3<(s=parseInt(t.value,10)))s=1e3;else if(~~s<200)s=200;r.height=s}if("link"===t.message)if(s=d.createElement("a"),a=d.createElement("a"),s.href=r.getAttribute("src"),a.href=t.value,!o.test(a.protocol));else if(a.host===s.host)if(d.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener("message",c.wp.receiveEmbedMessage,!1),d.addEventListener("DOMContentLoaded",t,!1),c.addEventListener("load",t,!1);function t(){if(o);else{o=!0;for(var e,t,r,s=-1!==navigator.appVersion.indexOf("MSIE 10"),a=!!navigator.userAgent.match(/Trident.*rv:11\./),i=d.querySelectorAll("iframe.wp-embedded-content"),n=0;n<i.length;n++){if(!(r=(t=i[n]).getAttribute("data-secret")))r=Math.random().toString(36).substr(2,10),t.src+="#?secret="+r,t.setAttribute("data-secret",r);if(s||a)(e=t.cloneNode(!0)).removeAttribute("security"),t.parentNode.replaceChild(e,t);t.contentWindow.postMessage({message:"ready",secret:r},"*")}}}}(window,document); </script> http://www.wild-facts.com/wp-content/uploads/2011/02/Limulus_polyphemus.jpg700495Ever wonder how it is possible for an animal to remain unchanged for 455 million years? Well, the Horseshoe Crab has done just that and we look at few of their features.