Bull Shark Trivia Questions

True. Bull sharks are viviparous, meaning they give birth to live pups. Litter sizes vary, but usually range from 1 to 13. They are born fully developed and independent.

True. Bull sharks have specialized kidneys and glands that allow them to regulate salt levels, enabling survival in both environments. They are among only a handful of shark species with this ability.

True. Bull sharks swim up the San Juan River from the Caribbean Sea into Lake Nicaragua. They are a well-known population in this freshwater lake, disproving the idea that sharks can only live in saltwater.

False. While bull sharks are famous for freshwater tolerance, several other species—like the river sharks (Glyphis) and the Ganges shark—also live in freshwater exclusively or periodically.

False. Bull sharks have a relatively short lifespan, typically 12–16 years in the wild. Some may live longer in captivity, but 50 years is far beyond their known maximum age.

False. Despite urban legends, no verified bull shark attacks have occurred in the Great Lakes. The cold water and physical barriers (e.g., locks) make it extremely unlikely for bull sharks to reach them.

True. In 1937, a bull shark was captured near Alton, Illinois, more than 1,000 miles upriver from the Gulf of Mexico. This demonstrates their remarkable freshwater tolerance.

The name 'bull shark' comes from its stout, bullish body shape and aggressive temperament, not from head-butting behavior. They use their powerful jaws to bite prey.