The starfish is a special type of marine invertebrate. It has no brain or blood but instead have filtered sea water flow through its body. Although most people commonly know starfishes to have 5 arms, it is possible for them to have up to forty arms. The starfishes with the five arms are the most common one though.
The name starfish could be misleading because it is not actually a fish. It is, in reality, an echinoderm. Starfishes are very similar to sea urchins and sand dollars. Some scientists have also began to call it a sea star instead of a starfish.
With over two thousand species of starfishes around the world, they have a wide variety of differences. They can live in hot and cold climate. Their unique skin is able to protect them from different predators because it has a tough cover.
Starfishes only have one hole which serves as both it's butt and it's mouth. It consumes preys through that hole and releases waste through the same hole. The use their suction cups in their arms to pry open different shelled fish like clams and oysters.
Sources:
http://www.google.com/imgres?um=1&hl=en&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1366&bih=575&tbm=isch&tbnid=Cwaua9wxUI8o0M:&imgrefurl=http://animals.nationalgeographic.com/animals/invertebrates/starfish/&docid=gvXbhIu3ZZ-2WM&imgurl=http://images.nationalgeographic.com/wpf/media-live/photos/000/007/cache/star-fish_723_600x450.jpg&w=600&h=450&ei=IH_WT8WGIIqM2gXXyZWWDw&zoom=1&iact=hc&vpx=117&vpy=201&dur=971&hovh=194&hovw=259&tx=171&ty=112&sig=114823444161963020132&page=1&tbnh=166&tbnw=213&start=0&ndsp=12&ved=1t:429,r:0,s:0,i:141
http://www.google.com/imgres?num=10&um=1&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&biw=1366&bih=575&tbm=isch&tbnid=0_dbmbiE_wzO5M:&imgrefurl=http://morquecho-samantha.blogspot.com/2010/05/blog-13-compare-circulation-of.html&docid=hKeEEuyr_aIQvM&imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0xfouTd4mA6y2mbvAPDr4teOQxmANwEXHdp2kSiPlSh0jRVn5CozH8soIkj6Gq2B0nK9C8IAKJRDw_ZTvnMcHIGQgLISPNFCj-uwvrzglkETutk5_ktr2PQ7icWHGXNiuxbLxQUMpS6o/s1600/I10-82-starfish.jpg&w=650&h=423&ei=WH_WT4yoJYmy2QXLyomCDw&zoom=1
http://www.google.com/imgres?num=10&um=1&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&biw=1366&bih=575&tbm=isch&tbnid=JY0yrt7quCBw6M:&imgrefurl=http://animalplanet.wikispaces.com/Gabby%2B%2526%2BEmily%27s%2BInvertebrate%2BReflection%2Band%2BAnalysis&docid=dRms6St9pD5XsM&imgurl=http://animalplanet.wikispaces.com/file/view/water_vascular_system.jpg/53377906/water_vascular_system.jpg&w=400&h=275&ei=WH_WT4yoJYmy2QXLyomCDw&zoom=1
The name starfish could be misleading because it is not actually a fish. It is, in reality, an echinoderm. Starfishes are very similar to sea urchins and sand dollars. Some scientists have also began to call it a sea star instead of a starfish.
With over two thousand species of starfishes around the world, they have a wide variety of differences. They can live in hot and cold climate. Their unique skin is able to protect them from different predators because it has a tough cover.
Starfishes only have one hole which serves as both it's butt and it's mouth. It consumes preys through that hole and releases waste through the same hole. The use their suction cups in their arms to pry open different shelled fish like clams and oysters.
Sources:
http://www.google.com/imgres?um=1&hl=en&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1366&bih=575&tbm=isch&tbnid=Cwaua9wxUI8o0M:&imgrefurl=http://animals.nationalgeographic.com/animals/invertebrates/starfish/&docid=gvXbhIu3ZZ-2WM&imgurl=http://images.nationalgeographic.com/wpf/media-live/photos/000/007/cache/star-fish_723_600x450.jpg&w=600&h=450&ei=IH_WT8WGIIqM2gXXyZWWDw&zoom=1&iact=hc&vpx=117&vpy=201&dur=971&hovh=194&hovw=259&tx=171&ty=112&sig=114823444161963020132&page=1&tbnh=166&tbnw=213&start=0&ndsp=12&ved=1t:429,r:0,s:0,i:141
http://www.google.com/imgres?num=10&um=1&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&biw=1366&bih=575&tbm=isch&tbnid=0_dbmbiE_wzO5M:&imgrefurl=http://morquecho-samantha.blogspot.com/2010/05/blog-13-compare-circulation-of.html&docid=hKeEEuyr_aIQvM&imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0xfouTd4mA6y2mbvAPDr4teOQxmANwEXHdp2kSiPlSh0jRVn5CozH8soIkj6Gq2B0nK9C8IAKJRDw_ZTvnMcHIGQgLISPNFCj-uwvrzglkETutk5_ktr2PQ7icWHGXNiuxbLxQUMpS6o/s1600/I10-82-starfish.jpg&w=650&h=423&ei=WH_WT4yoJYmy2QXLyomCDw&zoom=1
http://www.google.com/imgres?num=10&um=1&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&biw=1366&bih=575&tbm=isch&tbnid=JY0yrt7quCBw6M:&imgrefurl=http://animalplanet.wikispaces.com/Gabby%2B%2526%2BEmily%27s%2BInvertebrate%2BReflection%2Band%2BAnalysis&docid=dRms6St9pD5XsM&imgurl=http://animalplanet.wikispaces.com/file/view/water_vascular_system.jpg/53377906/water_vascular_system.jpg&w=400&h=275&ei=WH_WT4yoJYmy2QXLyomCDw&zoom=1
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