There are several factors that contribute to the differences in environments, habits, and interactions between humans and various shark species.

According to the International Shark Attack File for 2020, there were a total of 129 reported shark attacks worldwide, with 57 of them being unprovoked attacks. This is below the historical average of 80 attacks, indicating that the risk of being attacked by a shark species is extremely low in relation to the global population.

Among shark species, the great white, tiger shark, and bull shark are responsible for the majority of reported attacks. However, accurately identifying the specific species involved in attacks can be challenging, as victims often have limited opportunities to observe their assailants during the encounter. Tooth remains are seldom found in wounds, and distinguishing characteristics of many requiem sharks, such as those in the Carcharhinidae family, can be difficult to discern even for trained professionals.

When considering the geographical distribution of attacks, it becomes evident that human activities in the water play a significant role. Areas with a higher population of people engaging in water activities, such as surfing, tend to have more incidents. For example, Hawaii, known for its warm tropical waters and favorable conditions for tiger sharks, experiences an average of 3 to 4 tiger shark bites annually. In response to this, surfing has been prohibited in certain areas where attacks frequently occur, resulting in zero deaths in those regions in recent years.

Similar patterns can be observed in other regions. Australia, with its vast coastline and diverse waters ranging from warm in the north to colder in the south, sees a correlation between population growth and shark attacks. The Atlantic Ocean generally has a higher incidence of shark attacks compared to the Pacific Ocean. Florida, with its favorable weather and popularity as a tourist destination, attracts a significant number of visitors to its coastal areas, leading to a higher number of reported incidents.

It is important to note that tiger sharks are not indiscriminate “biting machines.” Their feeding habits are influenced by the balance of marine wildlife in their habitats. In locations where the ecosystem is more intact, tiger sharks exhibit more selective behavior in their attacks, resulting in fewer human fatalities. However, areas where environmental disruptions, such as the construction of ports, have occurred, have experienced an increase in tiger shark attacks.

While there is no definitive answer to the question of why attacks occur, several factors come into play. Preservation of the environment, lower population density, and less common water activities contribute to lower attack rates. Additionally, the hunting strategies of great white sharks and tiger sharks differ significantly, which may reduce confusion between humans and their natural prey. Great whites rely on power and speed to surprise their prey, while tiger sharks employ stealth and ambush tactics in shallow waters.

It is worth noting that scuba divers experience a relatively low rate of attacks, averaging only two unprovoked attacks per year according to the Program for Shark Research at Florida Museum of Natural History. Great white sharks are the primary attackers in scuba diving incidents, though the exact reasons for these interactions are still being researched.

Overall, understanding the complex factors influencing shark attacks involves considering habitat characteristics, human activities, and the unique hunting strategies employed by different shark species.