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9 Most Aggressive Animals in the World

In the animal kingdom, aggression is not uncommon, and some animals take it to a whole new level. From fierce predators to tiny creatures with a mighty sting, these animals are not to be underestimated. In this article, we’ll take a closer look at some of the most aggressive animals in the world and what makes them so dangerous.

9 Most Aggressive Animals in the World

Have you ever encountered someone with a short fuse? You know, the type who flies off the handle at the slightest provocation? Well, imagine encountering an animal with that same temperament. An animal that is not afraid to charge, attack, or even kill if it feels threatened or angry.

From their physical attributes to their behavior, let’s examine why these animals are so quick to fly off the handle.

1. Cape buffalo

Cape buffalo
Cape buffalo
  • Scientific name: Syncerus caffer caffer
  • Type: Mammal
  • Habitat: Sub-Saharan Africa
  • Size: 51–59 inches tall
  • Weight: Up to 1,910 pounds

Nicknamed the “Black Death or widow maker,” the bulls are notoriously aggressive and unpredictable. They are armed with large horns fused to the skull and are made up of a bony core covered in a keratin sheath. This makes the horns strong, durable, and capable of inflicting serious damage.

The horns curve outwards and upwards, then back inwards towards the head, forming a large “C” shape that makes for a formidable weapon. The Cape buffalo is not afraid to charge or attack if it feels threatened and can easily kill a lion or any other predator with one powerful thrust from its horns.

2. Saltwater crocodile

Saltwater crocodile
Saltwater crocodile
  • Scientific name: Crocodylus porosus
  • Type: Reptile
  • Habitat: Tropical and subtropical regions of Asia and Australia
  • Size: Up to 21 ft
  • Weight: 2,200–2,900 pounds

This apex predator is considered the largest living reptile in the world and one of the most aggressive. It has powerful jaws lined with sharp teeth capable of crushing bone. They are also excellent swimmers and can reach speeds of up to 18 miles per hour in water.

The saltwater crocodile will attack any creature, even humans, if they feel threatened or hungry. They have been known to lurk beneath the surface of the water and ambush unsuspecting victims, unaware of their presence.

3. Sun bear

Sun bear in tree trunk
Sun bear in tree trunk
  • Scientific name: Helarctos malayanus
  • Type: Mammal
  • Habitat: Southeast Asia
  • Size: 28 inches tall at the shoulder
  • Weight: 55–143 pounds

The sun bear is the smallest of the bear species but is also among the most aggressive. They get their name from the characteristic yellow or golden “U” shape on their chests which resembles a rising sun.

Sun bears are found in the tropical forests of India, Myanmar, Thailand, and Southeast Asia. They are omnivores but have been known to attack other animals if they feel threatened or if their territory is invaded. These bears have powerful jaws lined with sharp teeth capable of inflicting serious damage on an intruder.

They stand on their hind legs and growl or roar as a warning to any would-be attacker. If the threat persists, they are known to launch an attack with their razor-sharp claws and powerful bite. They can also climb trees with ease, making them an elusive predator.

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4. Wild boar

Wild boar in the woods
Wild boar in the woods
  • Scientific name: Sus scrofa
  • Type: Mammal
  • Habitat: Europe, Asia, and the United States
  • Size: Up to 4 feet tall at the shoulder
  • Weight: 150-250 pounds

This relative of the domestic pig is found in forests and grasslands across Europe, Asia, and parts of the United States. Wild boars are extremely aggressive animals and attack if threatened or provoked.

They have razor-sharp tusks that can be used to inflict serious injury on a human or other animal. These formidable creatures are also incredibly fast and can run up to 25 miles per hour.

When they sense danger, they often charge their attacker with loud grunts and snorts. Wild boars are omnivores and will eat just about anything, making them a very successful species in many parts of the world.

5. Cassowary

A cassowary foraging
A cassowary foraging
  • Scientific name: Casuarius
  • Type: Bird
  • Habitat: Australia and New Guinea
  • Size: Up to 6 feet tall
  • Weight: Up to 90 pounds

The cassowary is a large, flightless bird native to the tropical forests of Australia and New Guinea. They are believed to be the most dangerous bird in the world due to their sharp talons and powerful legs.

Cassowaries use their feet with three toes with long curved claws to kick and slash at any intruder or predator. When threatened, they use a stretch display where they extend their wings and raise their feathers while making a loud honking sound.

They are also excellent runners and can reach speeds of up to 31 miles per hour. Despite their intimidating presence, cassowaries are shy and peaceful animals that prefer to live in solitude. They primarily feed on fruits, fungi, and other plants found in the forest.

6. Wasp

Great black wasp
A great black wasp | image by Joseph Gage via Flickr | CC BY-SA 2.0
  • Scientific name: Vespidae
  • Type: Insect
  • Habitat: All over the world
  • Size: Up to 1 inch in length
  • Weight: Less than a gram

Wasps are small insects that can be found all over the world. They have stingers and powerful mandibles, which they use to hunt and defend themselves.

Wasps are highly aggressive and sting multiple times if attacked, even when not provoked. They can also release a pheromone that attracts other wasps to the area.

Although their stings can be painful, the venom is usually not deadly unless you are allergic. Wasps are social creatures that build nests in trees and in the ground, which they will fiercely defend against intruders.

7. Moose

Moose | Image by David Mark from Pixabay
  • Scientific name: Alces alces
  • Type: Mammal
  • Habitat: North America, Europe, and Asia
  • Size: Up to 6.9 feet tall
  • Weight: Up to 1,600 pounds

The Moose are the largest species of deer. They have huge, powerful antlers that can reach up to 6 feet wide. These impressive animals are also surprisingly swift runners capable of reaching speeds up to 35 miles per hour. They feed on leaves, bark, twigs, and aquatic plants and can consume up to 60 pounds of food daily.

Although usually peaceful, moose can become aggressive if provoked or threatened. They will charge their attacker with lowered heads and sharp antlers, making them one of the most dangerous animals in the wild.

8. Tasmanian devil

Tasmanian Devil
Tasmanian Devil | Image by Penny from Pixabay
  • Scientific name: Sarcophilus harrisii
  • Type: Mammal
  • Habitat: Tasmania, Australia
  • Size: Up to 2 feet long
  • Weight: Up to 18 pounds
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The Tasmanian devil is a carnivorous marsupial native to the island of Tasmania. Despite its small size, it is a powerful hunter with sharp teeth and a strong bite. It feeds on small mammals, reptiles, insects, and carrion.

It gets its name from its looks and behavior, which include its red ears and mouth, coupled with its loud screeching noises. Tasmanian devils are also known for their ferocity and will fight over food or mates without hesitation. They are highly territorial and fiercely defend their patch from intruders.

It will charge at its assailant while shouting, howling, and displaying its sharp teeth when threatened. It may even spin around in response to the threat.

9. Western diamondback rattlesnake

Western Diamondback Rattlesnake
Western Diamondback Rattlesnake | image by Larry Smith via Flickr | CC BY 2.0
  • Scientific name: Crotalus atrox
  • Type: Reptile
  • Habitat: The desert regions of the Southwestern United States and Northwestern Mexico
  • Size: Up to 6 feet long
  • Weight: Up to 10 pounds

The western diamondback rattlesnake is a venomous pit viper. It is characterized by its diamond-shaped pattern along its back and a distinct rattle at the end of its tail. The snake uses this distinctive noise to warn potential predators or prey of its presence.

Although they are generally shy creatures, the western diamondback rattlesnake can become aggressive if provoked or feel threatened. They can quickly strike their target with lightning-fast speed and deliver a powerful dose of venom.