Back to topics

Finding prey through returning echoes

An echolocating bat uses the delay and character of returning sound to follow a target. Its calls can change as it approaches prey, connecting the sound it sends with the information it needs next.

3–5 min

Questions you could explore

  • What information is carried by the returning echo?
  • How do calls change as a bat approaches prey?

Start reading

Ready to try your ideas aloud?

Your topic carries over. Record up to 2½ minutes, depending on your plan.

Nature and biology

How does a honey bee dance give directions?

A returning honey bee can communicate about food without leading every other bee to it. The direction and duration of its waggle dance carry information that other bees can use beyond the dark hive.

3–5 min

How does a honey bee dance give directions?

Nature and biology3–5 minA returning honey bee can communicate about food without leading every other bee to it. The direction and duration of its waggle dance carry information that other bees can use beyond the dark hive.

Nature and biology

How can an octopus change color so quickly?

An octopus can alter the appearance of its skin far faster than a new coat of pigment could grow. Tiny structures already in the skin control what becomes visible, with pigment and reflected light playing different roles.

5–7 min

How can an octopus change color so quickly?

Nature and biology5–7 minAn octopus can alter the appearance of its skin far faster than a new coat of pigment could grow. Tiny structures already in the skin control what becomes visible, with pigment and reflected light playing different roles.

Nature and biology

A coral can turn white while it is still alive

Coral bleaching involves a breakdown in the relationship with tiny photosynthetic partners. A coral can turn white while still alive; what happens next depends on the stress and opportunity to recover.

3–5 min

A coral can turn white while it is still alive

Nature and biology3–5 minCoral bleaching involves a breakdown in the relationship with tiny photosynthetic partners. A coral can turn white while still alive; what happens next depends on the stress and opportunity to recover.

Finding prey through returning echoes | Speech Topic | speaking.app