Are giant squid really the only aqua animal to kill sharks?
491000
No, all sorts of animals will kill sharks including jellyfish, eagles, dolphins, snakes, crocodiles and countless predatory fish such as barracuda.\n\nThere isn't very much special about sharks, they are just another fish. In the ocean any fish will be eaten by most fish that are bigger then it. Sharks are no exception. If a barracuda or marlin is bigger then a shark then it will eat the shark. If an eagle can catch a shark near the surface it will do so.\n\nSharks are eaten as much as any other fish in the ocean, and by just as many predators.\n\nAnd giant squid wouldn't eat very large sharks. Despite their large size they live mostly on prey animals much smaller than themselves. Any shark much bigger than a dogfish would probably be safe from a squid.
292755
On land, the elephant.  In the sea, the whale shark, however, more and more evidence is pointing towards giant squid that, until recently, was thought to be just a myth.
39061
"Unbelievably, a goldfish can kill a gorilla.  However, it does require a substantial element of surprise."\n\nSo I vote yes, and much more easily than a goldfish could. :D
560596
Yes, they can. The pacific giant octopus lives about two years and it can regenerate lost tentacles until it reaches an age of almost two years old when it loses the ability to regrow lost arms. Squid are also mollusks like octopi and cuttlefish, I believe they have that ability too.
854620
no, sharks are NO invertebrates, they got a spine
1058660
The Australian salt water crocodile is a ferocious predater.\nSo is the great white shark.\nSalty's often swim great distances out to sea. (especially, off of Queensland Austraia.\nThe shark has an advantage because it does not have to surface for air.\nSteve Irwin got some great footage of just such a battle, & screened it on his show "crocodile hunter".. The shark lost a pectoral fin and almost was killed. But the salty surfaced for a gulp of air and was nailed by the shark for his moment's inattention.
438261
hello yahoo pal,\n\n    \n  The fear of sharks has been fueled by a few rare instances of unprovoked attack, such as the Jersey Shore Shark Attacks of 1916, and by sensationalized fiction and film, such as the Jaws series. The creater of the Jaws phenomenon, Peter Benchley, has himself in recent years attempted to dispel the myth of sharks being maneating monsters. In 2005 there were worldwide a total of 58 unprovoked attacks of which 4 were fatal [2]. Several hundred people die annually from lightning strikes and 1.3 million people die from diseases transmitted via mosquito bites.\n\n \nSnorkeler with Blacktip Reef Shark.Contrary to popular belief, only a few sharks are dangerous to humans. Out of more than 360 species, only 4 have been confirmed to have killed appreciable numbers of humans in unprovoked attacks: the Great White, Tiger, Bull, and Oceanic Whitetip sharks. These sharks, being large, powerful predators perfectly capable of eating humans, may sometimes attack and kill people, but all of the above sharks, even the Great White, have been filmed in open water, with no cage [3], time and time again, without incident.\n\nThere are many theories about why sharks sometimes attack people. Some claim that the shark is confusing a human for a seal or other prey animal; this would be typical in the case of an attack against a surfer. This is because the shape of a surfer lying on a board closely resembles a seal from beneath the surface. Also, sharks have sensory organs on their nose to pick up electrical signals, such as movement. Often the shark that attacks a human will make only one bite and then go away. This behaviour has many possible explanations, one being that humans don't taste good (or at least, as good), or are lacking the necessary fat, and another being that sharks normally make one swift attack, and then retreat and wait for the victim to die, or exhaust itself, before it comes back to feed. This protects the shark from retribution from a wounded and aggressive target, but also allows humans the time to get out of the water and survive. Another theory is that the electrical receptors, which pick up movement, do not pick up the same signals from a wounded human as they would a wounded seal, and so they are more cautious. In fact, it has recently been shown that surfers do not give off the same electrical signals as seals, or it is thought there would be far more attacks.\n\n \nContrary to popular belief the Great White Shark does not target humans as prey.A number of other species (perhaps 10 - 15) have threatened, attacked, and/or bitten, but not killed large numbers of humans without being obviously provoked. This group contains the Mako, Hammerhead, Gray Reef, Black Tip Reef, Lemon, Silky and Blue sharks. These sharks are also large, powerful predators which can be provoked simply by being in the water at the wrong time and place, but they are normally considered less dangerous to divers and swimmers than the previous group. In most cases, if a person moves away calmly, or remains still, they will be ignored. Many shark species are known to "display" when feeling threatened, and it is ill-advised to remain in the vicinity at such a time as this would generally be considered enough provocation to warrant an attack.\n\nA few other shark species do attack people every year, producing wounds that can potentially kill, but this occurs either specifically because they have been provoked, or through mistaken identity due to water conditions or the like.\n\n[edit]\nSpeed\nIn general, sharks swim ("cruise") at an average speed of 8 kilometers (5 miles) per hour, but when feeding or attacking, the average shark reaches speeds upwards of 19 kilometers (12 miles) per hour. One exception to this generality is the Mako shark, whose speed may range upwards of 48 kilometers (30 miles) per hour. The Mako shark is considered to be the fastest shark and one of the fastest fish. Also the Great White Sh
1168795
cephalopods are squid, right?
1138559
African Bush Elephants have in fact gored and killed Black Rhinos before. It's the only animal that can kill it and they found holes in the carcass where it was obvious it was gored to death.
403583
Despite it now weighing more than a fraction of an ounce, the Harvestman spider (daddy longlegs) is one of the most deadly organisms. No, it is not able to kill many mammals, but for its size, its venom is more potent than any other venom.
627487
can they? most likely. Would they? its unlikey.\n\nA little fact about sharks is that they like fatty foods, the more calories they can consume while expending as little as possible is ideal shark food. \n\nWhen they "attack" a surfer they are usually doing an exploratory bite. Surfers are usually very lean and dont make good shark foood. In addition they usually bite the board also, which tastes terrible to them.
573122
The whale shark is the biggest fish.\nWhales are mammals and cannot be called "fish".
972730
Apparently the only place you can stab a crocodile to kill it is in the eyes and the underarms. Everywhere else is too hard.\nSharks likely have thick skin to keep them warm in cold waters. I have heard a couple stories of people being in a boat surrounded by sharks and being able to cut the shark so that otehr sharks attacked it instead of the boat. People often eat shark. Its a lot easier to kill a shark than it is to kill a crocodile.
726452
None - Cuttlefish have tentacles.\n\nCuttlefish are marine animals of the order Sepiida belonging to the Cephalopoda class (which also include squids, octopuses and nautilus). Although the name suggests it, cuttlefish are not fish, but molluscs.
127380
A mako shark is exceedingly fast. It feeds on some of the fastes tunas and billfish that otherwize would not have their populations kept in check or slower specimuns weeded out. It is an appex predator or in other words it sits at the top of it's ecological niche with nothing feeding on it. It also feeds on squid, dolphins, porpoises, Bluesharks, sea turtles, and mackerals.
596488
I dive with them all the time without a cage. I live in Miami and we go diving with sharks every weekend. The only Shark I would be concerned about would be a great white. We see Mako's, bull, hammerhead, etc. all the time. They will not hurt you unless you have a fish or look like an easy meal.
684077
There are certain fish, when introduced to a specific location will kill all the natural fish in the that area.  There is also a noxious ivy weed, I belive it is called Kudso, that will take over everything it comes into contact with, it grows extremely fast.  It has been known to take over entire fields, buildings, and towns.  It is almost impossible to eradicate.  I will modify my answer if I can think of the name of fish I am thinking about.  Something else, many years ago Hawaii was overrun with rats (or was it snakes?) so they decideed to bring in mongoose's (or is it mongeese? LOL), the mongoose ate all the rats (snakes?) and now they are no more.  It is illegal to bring a snake to Hawaii, so it was probably snakes.