Though sharks are considered apex predators, they are often eaten by humans and are sometimes eaten by killer whales. Shark embryos from different fathers will also eat each other in utero, with the largest embryo of the bunch usually winning out.
A:Whale sharks live in all seas that are tropical or warm-temperate. Generally whale sharks range no further south than South America and no further north than the United States. They prefer warmer waters near the equator.
A:The great white shark is an apex predator, and as such, healthy adults of the species have no natural predators. Only one real threat faces the great white shark: humans that accidentally catch them, illegally poach them, pollute the waters they live in or lay nets along coastlines that may entrap them.
A:To identify shark teeth, make a note of the tooth's identifying characteristics and compare it with literature or pictures of shark teeth. You need a magnifying glass to help review the tooth. Written and pictorial information helps identify most teeth.
A:According to Discovery Communications, the biggest great white shark ever reported was 23 feet long. It was caught off the coast of Malta by Alfredo Cutajar in 1987, however there is still some debate as to if the measurement was accurate or not.
A:Baby sharks, appropriately called "pups," eat smaller quantities of the same food that adult sharks eat. Although the exact composition of the diet will vary due to species, environmental factors and availability, most shark pups eat fish, mollusks, crustaceans, krill, marine mammals and plankton.
A:Most sharks are not physiologically capable of living in freshwater, although the bull shark is an exception. In order to live in freshwater, the body of water would need to be wide and deep enough to accommodate the shark, and it would have to be connected to the ocean for the shark to get there in the first place.
A:Over the years, experts have been trying to determine exactly why great white sharks attack humans. Three of the main theories include the investigatory theory, mistaken identity theory and social-defensive theory.
A:Newborn shark sizes vary by shark species; for example, a newborn great white is typically about 4 feet long, while blacktip reef shark newborns are considerably smaller, usually more than 20 inches in length. Whale sharks, which are quite large in adulthood, give birth to live pups rather than laying eggs, and these newborn pups are typically about a foot and a half long, or 21 to 25 inches in length. Growth rates subsequent to birth may also vary by species.
A:If you are attacked by a shark, it is important to fight back and get out of the water as soon as possible, but there are also important tips to learn to avoid a shark encounter. Sharks generally don’t like to eat humans. When sharks bite humans it is usually a “hit and run,” where they bite the human out of curiosity and swim away. This usually happens in shallow water and is rarely lethal.
A:Sharks are capable of adapting quickly in different environments by adjusting their unique physical features to their surroundings. The shark can adjust its internal temperature to live in a various climates. The shark’s incredibly tough skin provides high defense from the attacks of other predators and the color of their skin gives them camouflage abilities underwater.
A:Though sharks are considered apex predators, they are often eaten by humans and are sometimes eaten by killer whales. Shark embryos from different fathers will also eat each other in utero, with the largest embryo of the bunch usually winning out.
A:The nurse shark has thousands of small notched teeth. The jaws of the nurse shark are powerful and are used to crush hard prey, including shellfish. Fish, shrimp and squid compose the other portions of the nurse shark's diet.
A:The next time you’re walking down Broadway, consider this: you are ten times more likely to be bitten by a human in New York City than by a shark off the coast of Florida. Surprising as that may seem, statistics have consistently shown that sharks aren’t a major threat to humans. While sharks certainly aren’t harmless, their danger to humans is exaggerated by news stories, B movies like Sharknado and other unfavorable pop culture references.
A:Sharks have the ability to see, but they cannot see colors. Dolphins, whales and other aquatic animals are also color-blind. Marine animals' survival is not dependant on the ability to see color, but rather the ability to see contrast in colors.
A:Most scientists classify the relationship between the shark and the remora as a commensalit relationship, because the remora benefits from the transportation and food that the shark provides, while the shark does not seem to be harmed. However, there are some scientists who believe that the remora are irritating to sharks, and others who believe the relationship is symbiotic.
A:Sharks actually attack dolphins on occasion, but sharks are wary of them because dolphins have excellent detection skills in the water, are highly intelligent, attack in groups and occasionally protect other mammals including humans even if they aren’t part of the dolphin’s pod. According to Sharks-World, sharks aren’t so much afraid of dolphins as they are confused by the sounds that dolphins make.
A:Of the 400 or so shark species on the planet, the shortfin mako shark is thought to be the fastest, capable of swimming at speeds from 22 to 60 miles per hour. Makos are aggressive, however attacks on humans are rare because the species usually stays in the open ocean.