By asking who, I assume you mean human groups. Thus, I would answer people or industrialists who pollute the air and water. And another fierce enemy would be poachers. These hunters do not obey the hunting laws that are designed to preserve the species.
All animals are territorial creatures. Hamsters are more aggressive animals when dealing with the same gender. If you have two male or female hamsters in one cage, you are begging for trouble.
There are many animals that are worst enemies but one of them are the human being an tigers. This pair of animals are worst enemies because poachers kill tigers for their fur and sometimes poachers are killed by tigers.
Whatever goes upon two legs is an enemy.Whatever goes upon four legs, or has wings, is a friend.No animal shall wear clothes.No animal shall sleep in a bed.No animal shall drink alcohol.No animal shall kill any other animal.All animals are equal .
The inhabitants of ancient Athens and Sparta were fierce enemies in ancient Greece. The two city-states were rivals for power and influence in the region, leading to the Peloponnesian War in 431 BC. The Athenians were known for their democratic government and naval power, while the Spartans were renowned for their military prowess and strict society.
When David was a shepherd boy he killed a lion and a bear as well.
The inhabitants of Athens and Sparta were fierce enemies in ancient Greece. Their rivalry culminated in the Peloponnesian War, which lasted from 431 to 404 BCE. This conflict highlighted their contrasting cultures, with Athens representing democracy and arts, while Sparta embodied militarism and discipline. The war ultimately led to significant shifts in power and influence in the Greek world.
There are two different ways that animals can protect them selves there's camouflage, weapons (animal parts used for attack)
Giant squids only have one main natural enemy - the sperm whale, which preys upon them. There has been evidence from the bodies of sperm whales that these two ocean dwellers engage in fierce battles far beneath the water's surface. Smaller squid are eaten by lots of other animals including albatross and humans.
"I will work harder" and "Napoleon is always right"
Enemies are never formed for life. Two enemies can be turned to friends easily.
Anyone invloved in a peace ceremony are former adversaries. Meaning they are all enemies.
Flash's arch enemies is the two zooms