They warn enemies by opening the patch below their head and seems to be bigger in size to enemies.
the porcupines only have 2 enimes (1. the mountain lion)and (2. the fisher cats)
great horned owl bobcats black martin cougars
Porcupines have sharp spines on their back which will harm predators if they touch them. Porcupines also can blend in with its natural surroundings.
Porcupines protect themselves with the spiny quills on their backs, and are members of the rodent family. Their enemies are coyotes and cougars.
yes
The porcupines main enemy is human, many cultures in Asia especially in Vietnam eat porcupine, their quills are also used to decorate traditional headdress and clothing.
Aposematism
In "Swiss Family Robinson," Jack understood the fallacy of believing that porcupines can shoot their quills at enemies. He demonstrates understanding of this fallacy by debunking it and explaining that porcupines actually defend themselves by raising their quills and backing into attackers.
Porcupines attack because of fear - if they feel scared or threatened, they will attack or attempt to warn off their enemy.
Other porcupines in order to live. This competition caused by overpopulation, causes the population to decrease which as the result kills the porcupines. The porcupine competes with other porcupines for for food, water, and other limiting factors.
He wanted to warn enemies about America's strength.