10 Most Dangerous (and Deadliest) Mammals in the World


Mosquitoes are responsible for transmitting diseases such as malaria, dengue fever, and Zika virus, making them one of the deadliest animals on Earth.



While not a species-wide trait, humans can be dangerous due to violence, crime, and the ability to create and use weapons.

Box Jellyfish:

Found in the waters of the Pacific and Indian Oceans, the box jellyfish has tentacles with toxins that can cause heart failure and death in humans.

Saltwater Crocodile:

Known for its aggressiveness and powerful bite, the saltwater crocodile is responsible for numerous fatal attacks on humans.

African Elephant:

While generally peaceful, elephants can become aggressive, especially when provoked or during musth.


Despite their seemingly docile appearance, hippos are responsible for more human deaths in Africa.

Cape Buffalo:

Considered one of the most dangerous animals in Africa, Cape buffaloes are known for their unpredictable behavior and are responsible.

Polar Bear:

Polar bears are powerful predators and can be dangerous to humans, especially in the Arctic regions where they may see humans as prey.

Rabies-Carrying Animals:

Animals such as dogs, bats, and raccoons can carry and transmit the rabies virus, which is often fatal if not treated promptly.

Tsetse Fly:

Found in Africa, the tsetse fly transmits a parasite that causes African trypanosomiasis (sleeping sickness), a potentially fatal disease in humans.