What conclusion can you base on evidence found in both texts?

• All animals can use ultrasound and infrasound to communicate.

• Some animals use sounds to tell each other about possible

  threats.

• Scientists continue to discover new ways that animals

  communicate.

• Body language is as important to elephant communication as

  sound is.

Choose ONE detail from BOTH TEXTS to support the fact that some animals use sounds to tell each other about possible threats.

• Their ears open up wide and appear to hear distinct sounds,

  and yet the humans observing the scene nearby hear nothing.”

  (“Incredible Animal Ears”)

• “These scientists concluded that the low sounds were actually

  warning sounds from another herd.” (“Incredible Animal Ears”)

• “Sound travels in waves, and its pitch, or frequency, is measured in a unit that scientists call hertz.” (“Animal Sounds”)

• “Rats giggle at the ultrasound levels, and squirrels warn one

  another of danger by making high-pitched noises.” (“Animal

  Sounds”)

What is the central idea of “Animal Sounds”?

• Humans can hear sounds that are between 20 and 20,000 hertz.

• Many animals communicate with each other using sounds that people cannot hear.

• Some animals can hear very low-pitched infrasonic sounds.

• Most ultrasonic sounds made by animals are too high-pitched for humans to hear.

What detail supports the idea that many animals communicate with each other using sounds that

people cannot hear?

• The diagram shows animals that can hear outside the range of

  human hearing.

• The diagram shows that ultrasonic sounds are higher than

  infrasonic sounds.

• The diagram shows that animals with infrasonic hearing tend to

  be larger than humans.

• The diagram shows that some small animals have ultrasonic

  hearing

What are the two sounds that animals can hear?

• infrasonic, frequency

• hertz, pitch,

• infrasound, ultrasound

In “Incredible Animal Ears,” what causes the elephants to stop suddenly and why wouldn’t humans watching understand why they are stopping?

• The warning sounds are made a many different levels only the elephant can hear

• Humans need technology to hear the warning sounds

• Another herd makes the sounds that humans can't hear

• The elephants hear warning sounds that are at a lower pitch