Sharks, despite their reputation as fearsome marine predators, genuinely fear dolphins. This curious phenomenon has several substantive reasons behind it.
First, dolphins possess significant physical advantages. Their bodies are powerful and streamlined, making them exceptionally fast and maneuverable in water. An adult bottlenose dolphin can reach speeds of up to 23 mph (37 km/h), which exceeds the speed of most shark species. Additionally, dolphins typically travel in groups (called "pods"), giving them a numerical advantage.
Second, dolphins use their hard, bony rostrums (elongated snouts) as effective weapons. When attacking, they can develop tremendous speed and ram sharks in their most vulnerable body parts – the gills and abdominal cavity. Such impacts can cause serious injuries or even lead to the death of a shark.
Third, dolphins possess high intelligence and advanced communication abilities. They coordinate their actions when defending or attacking, making them dangerous opponents even for large predators. When encountering a shark, a group of dolphins often surrounds it and attacks from all sides, leaving no opportunity for escape or counterattack.
There are documented cases where dolphins have deliberately attacked and killed even large sharks, including great whites. In some situations, they do this to protect their calves or pod members. In other cases, dolphins may perceive sharks as competitors for food resources.
Interestingly, some swimmers who found themselves dangerously close to sharks have been saved by dolphins, which formed a protective ring around the human. This phenomenon has been documented by numerous testimonies throughout history.
Thus, sharks' fear of dolphins has a very real foundation and exemplifies how even recognized predators in nature can have their natural adversaries.