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I don't think they have a way of protecting themselves. They are usually eaten by whales anyways and there isn't much protection from a whale if you are as small as krill. They can protect themselves but not against whales. They protect themselves by traveling in large numbers.
In WWII soldiers would hide behind their dead horses to protect themselves from the enemy. They would have a less chance of getting hit and so they had more chance of survival. Also the enemy wouldn't see them on the ground so it was easier for the soldiers to kill their enemy.
Llamas protect themselves by running away. They also spit when irritated or guarding a baby.
Gas masks are used to protect people especially soldiers when gases are used in warfare or domestic disturbances. They were used in World War I to protect soldiers against mustard gas.
The gas mask
To protect soldiers during war and crusades
Animals develop characteristics or behaviors that allow them to survive longer.
All of the missions had 5-6 soldiers living at the missions.
So they can protect themselves from the other army. Plus, they don't always use guns.
Ran back the direction they came.
They protected themselves by using bags of sand to block the bullets, hide in their trenches, or find some other protection
The use of mustard gas in World War One was a terrible and inhumane weapon. Gas masks were the best protection soldiers had to avoid breathing in this gas.
They protect themselves by squirting ink.
They dug trenches to protect themselves from the weapons of the enemy. Turks vs. British
Citizens protect themselves with police departments. Nations protect themselves with a military.
they use their sting tail to protect themselves
how do lionfish protect themselves