 
										Humans use language to communicate. Animals communicate, too. Find out how.

Some animals use sound. Each penguin has a special call. Other penguins hear the sound and know who is calling.

Some animals light up. 
Jellyfish can make their bodies glow. They light up when a predator
                                
                                    
                                    
                                
                                
								
									predator
                                     BY WILDESTANIMAL—GETTY
                                    
										an animal that kills and eats other animals to survive
										(noun)
                                    
                                    The great white shark is a fierce predator. 
                                
                             comes near. The light scares the predator away.
                                    BY WILDESTANIMAL—GETTY
                                    
										an animal that kills and eats other animals to survive
										(noun)
                                    
                                    The great white shark is a fierce predator. 
                                
                             comes near. The light scares the predator away. 

Some animals 
use movement.
 Fiddler crabs wave their claws in the air. They do this to attract
                                
                                    
                                    
                                
                                
								
									attract
                                     NEAGONEFO—GETTY
                                    
										to cause something to come closer
										(verb)
                                    
                                    Streetlights attract moths. 
                                
                             a mate.
                                    NEAGONEFO—GETTY
                                    
										to cause something to come closer
										(verb)
                                    
                                    Streetlights attract moths. 
                                
                             a mate. 

Some animals use color. An octopus changes its color. A light color means the octopus is friendly. A dark color means it is angry.
Did You Know?

Dolphins don’t have ears. But they understand sounds made by other dolphins. How? Sound makes vibrations
                                
                                    
                                    
                                
                                
								
									vibration
                                     TASSII—GETTY
                                    
										a series of small, fast movements going up and down or side to side
										(noun)
                                    
                                    The vibration of my cell phone lets me know someone is calling. 
                                
                             in water. Dolphins feel the vibrations in their jawbone.
                                    TASSII—GETTY
                                    
										a series of small, fast movements going up and down or side to side
										(noun)
                                    
                                    The vibration of my cell phone lets me know someone is calling. 
                                
                             in water. Dolphins feel the vibrations in their jawbone.
 
						



 
				 
				 
				 
				


