Shark meat can be eaten by humans, but the U.S. Food and Drug Administration recommends limiting consumption to once or twice a month. Shark liver should not be eaten, as it contains toxic levels of some vitamins. More »

There is no safe shark meat to eat because all shark meat potentially exposes a person to high levels of mercury, according to CNN. The US. Environmental Protection Agency advises children, women who might become pregnan... More »

Crab is safe to eat while pregnant as long as it is consumed in moderation, according to BabyCenter. The largest problem with eating seafood while pregnant is the danger posed by environmental pollutants, such as mercury... More »

Shark eggs vary in appearance by species, although most have a leathery protective case, and they are often shaped like corkscrews. Tendrils or other attaching appendages are present on others to assist in their attachme... More »

www.reference.com Pets & Animals Marine Life Sharks

Mary Lee the Shark is a 16-foot, 3,456-pound great white shark that travels up and down the eastern seaboard. Researchers from OCEARCH have been tracking her movements since 2012. More »

www.reference.com Pets & Animals Marine Life Sharks

Shark teeth are identified by analyzing the size, shape and texture of a tooth. While most shark teeth are in the shape of a triangle, the length, width and sometimes the edges of a given tooth can be used to identify th... More »

www.reference.com Pets & Animals Marine Life Sharks

The most noticeable difference between the extinct Megalodon and its modern-day counterpart, the Great White Shark, is that the Megalodon was much larger. Scientists attempt to discern more subtle differences between the... More »