i know that they have a mouth like a sucker fish, of a carp, but do they have teeth?
204966
yes - and very nice eggs  .......very expensive eggs  :o)
378777
dolphin and pike (Osteichthyes) have bones; sea cucumber and flounder do not have true bones they are cartelagenous fish (Chondrichthyes)  the sea cucumber has no skeletal system.
225403
pbustudent:\nnice try!\nEver heard of blind cave fish? They start with eyes and lose them soon after?  Is that a perfect design?\n\nbenefical mutations:\nhttp://www.gate.net/~rwms/EvoMutations.html\nIn humans:\nhttp://www.gate.net/~rwms/EvoHumBenMutations.html\n\nWaiting for your apology...
29221
I agree with big brain, they are some of the most efficent and dangerous killers in the animal kingdom. \n\nAlthough they do have communication patterns. Male crocodiles let out a low grunt when they are searching for a mate. And baby crocodiles let out a high pitch grunt when they are in danger. Not too sure about the sharks though.\n\nMost of the time though as big brain said they are solitary animals.
571327
Full lips, nice teeth.  They seem to go together
622643
Great question!\n\nFish have what we might call the "beginning" of a cortex.  Non-vertebrate chordates do not.  It should be noted that cephlopods have a nervous system that rivals a cortex (certainly surpasses that of fish).
474741
Guppies don't really hear... And if they did, it wouldn't be by their gills. They use their gills to breathe. Instead, they follow vibrations. I'm not quite sure how, but I think they have a sense organ that detects vibrations in the water.
609111
No, they are eaten quite often by the natives who fish them out of the rivers.
252451
Carp can change its gill structure by having a lack of protruding lamellae (primary site for gas exchange) for survival in anoxic (without or limited oxigen) water. Therefore, they can breath air and forget about its oxigen consumption for around a month if they want.
71024
There are viper fish, deep sea anglers, and brotulids to name a few. Some are blind but some have bioluminescence, or in other words they can glow in the dark and have huge eyes. They came to live so deep very gradually over millions of years.
657465
OH, you mean CANINE TEETH.\n\nSpelling is important if you wish to be understood child.\n\nFirst off snakes don't have canines. Most mammals do have canines, including humans.\n\nCanines are the elongated, sharply pointed teeth near the front of the jaw. They are commonly called fangs although that name is incorrect since fangs are hollow teeth and canines are always solid.\n\nCanines are designed to allow predatory animals to grasp prey. They are sharp so they can puncture skin and muscle when the animal bites, and they are long so that when they go in they won't slip out until the animal opens its jaw.\n\nSome herbivorous animals also retain their canines from their more carnivorous ancestors. The largest canines belong to the African hippopotamus, and although hippos are vegetarians their canines are over a foot and half in length. Hippos use their canines for fighting other hippos rather than for catching prey.\n\nCelbone canines are not used for tearing. They are used for gripping. The incisors and premolars and incisors are used for tearing.
421156
Well, that depends on your definition of "tail".\n\nIf a tail is defined as an extension of the vertebrae (or notochord) behind the anus or cloaca, then most fish do have a tail.\n\nThere are some few exceptions, for example the ocean sunfish ( http://www.oceanlight.com/html/mola_mola.html). These fish don't have a caudal fin with normal tail vertebrae; it is replaced by modified caudal elements. This condition is known as "gephyrocercal" (http://www.briancoad.com/Dictionary/DicPics/gephyrocercal.htm).\n\nIf, however, you're thinking of a typical caudal fin, there are many fishes without them, such as eels and other anguilliform species. However, they usually do have caudal vertebrae (it is the membrane that they lack).
638855
they have horns. Look for small antennae at the back of their head too thats a sure sign that they are good freinds. Just keep those bots away from water
2762
Yes, sperm have a small circular row of non moving teeth.
603570
That sounds like southern sting rays. We have a lot of them in Florida in the summer. Skates are found more on the bottom. They are both related to sharks and have an internal skeleton made of cartledge.\nHere are some good pictureshttp://www.pbs.org/wnet/nature/sharks/
72206
They could *be* shark teeth. There are plenty of places where you can pick them up right off the sand if you know where and how to look for them.
432556
Blue tangs do not have any such growth.  However, young unicorn tangs can look much like blue tangs so the aquarium may have mislabeled the fish.  As the unicorn tang grows, a protuberance appears and grows above its eyes.  In the early stages of this growth, the protuberance may look like fungal growth.  The link below has a picture of a unicorn fish with an extensive protuberance.  If the growth was anywhere other than directly above the eyes, as in the linked picture, then it was a parasite which may victimize tangs to the exclusion of other fish.  Many species and genuses of tropical fish have parasites that infect them and them alone - tangs are not known to be particularly parasite prone and are considered to be fairly hardy aquarium fish.