Threatening behavior by predators causes a porcupine to extend its quills.
Porcupines only inflate and extend their spines as a defense mechanism.
Porcupine can use its quills as a defense mechanism.
porcupine can use its quills as a what
- encoded information
- threatened
- defense mechanism
- cushion
- protective bony armor
- cleaning mechanism
- if humans disturb bears
- brush