Are people to blame? Four humans have been bitten by sharks in just 48 hours in Australia, two sustaining critical injuries as a result. Scientists say we humans may be the real problem.
‘Perfect storm’ causes shark attack spree
Jaws: They may not be as famous as great whites or tiger sharks, but bull sharks are one of the most dangerous shark species. Glossary
vertebrate - An animal that has a backbone or spine.
Greenland shark - A large predatory shark that lives in the Arctic. They can live to well over 100 years old.
Ecological niche - The role a species plays in its ecosystem, including where it lives, what resources it uses, how it survives, and how it interacts with other organisms.
Australia - The largest country in Oceania, home to only 27 million people.
Estuaries - Where rivers meet the sea.
Nutrients - Substances that plants and animals need to live and grow. The six essential nutrients our bodies need are vitamins, minerals, protein, fats, water, and carbohydrates.
Disorientate - Cause someone to lose their sense of direction.
Pesticides - Poisons used for destroying insects and plants.
Traits - A person's characteristics or qualities.
Culling - Reducing the number of wild animals by systematically killing them.