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: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.
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:Because of its highly streamlined shape and powerful swimming muscles, a great white shark can swim up to 35 miles per hour in short bursts. In addition to its ability to swim in short bursts, a great white can also move at a steady cruising speed. Scientists recorded one great white that swam a total of 12,400 miles in nine months, an average of 45 miles each day.
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: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: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:To survive, great white sharks have evolved several behavioral adaptations, including flexible activity patterns, migratory habits and social hierarchies. However, great white sharks are also intelligent hunters, and their most important adaptation is their use of different strategies for different prey. Great whites are not commonly kept in captivity; so many aspects of their behavior remain unknown, as it is difficult to study them in the wild.
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:The megalodon was a prehistoric shark species that went extinct at least 1.5 million years ago; the reasons the giant predators disappeared remain a mystery. Megalodons were not only the largest sharks to have ever lived, they were also the largest marine predator to ever swim the world’s oceans. While some propose that the sharks may still swim the world’s oceans, most scientists agree they are extinct.
A:There are 465 known species of sharks that display different physical characteristics. Most are identifiable by their darker upper sides that blend with the water above and their white or lighter-colored undersides that blend with the sea below, in addition to their fins, side gill slits and rows of sharp teeth. Shark skeletons are composed of cartilage, a light and flexible tissue.
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: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: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: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.