- Echo is when sound reflects off of a surface
- A sound must first be emitted before it can reflect off of a surface
- Hence, a sound must be emitted for an echo to occur

- Echolocation is when some animals detect objects by hearing echoes by emitting sound
- An echo must occur in order to be heard
- Hence, echolocation requires echos to occur

- A sound must be emitted for an echo to occur
- Echolocation requires echos to occur
- Therefore, a sound must be emitted in order for an animal to echolocate

- A bat is a kind of animal
- Bats find their prey by sensing echos
- So, bats are a kind of animal that finds their prey by sensing echos

- Bats are a kind of animal that finds their prey by sensing echos
- Echolocation is when some animals detect objects by hearing echoes by emitting sound
- Therefore, bats find their prey by using echolocation

- A sound must be emitted in order for an animal to echolocate
- Bats find their prey by using echolocation
- So, bats must emit sound in order to echolocate

- Hearing is a kind of sense
- Hunting requires sensing prey
- So, hearing can be used for hunting prey

- Hearing can be used for hunting prey
- Hearing is used for sensing sounds by animals
- Therefore, sensing sounds can be used for hunting prey

- Sensing sounds can be used for hunting prey
- An echo is a kind of sound
- Hence, sensing echos can be used for hunting prey

- Sensing echos can be used for hunting prey
- Echolocation is when some animals detect objects by hearing echoes by emitting sound
- Therefore, echolocation can be used for hunting prey

- A sound must be emitted for an echo to occur0
- Bats must emit sound in order to echolocate
- So, bats must emit sound in order to hunt their prey

So, bats must emit sound in order to hunt their prey
[Question]Bats find their prey at night using one of their senses to detect echoes. What does the bat send out to find prey?
[Context]- A bat is a kind of animal 
- Bats find their prey by sensing echos 
- Echo is when sound reflects off of a surface 
- A sound must first be emitted before it can reflect off of a surface 
- Hearing is used for sensing sounds by animals 
- Echolocation is when some animals detect objects by hearing echoes by emitting sound 
- An echo must occur in order to be heard 
- Hearing is a kind of sense 
- Hunting requires sensing prey 
- An echo is a kind of sound