- A wolf is a kind of animal
- Establishing a territory requires keeping other animals away
- So, establishing a territory can require keeping other wolves away

- Howling is a kind of sound
- Sound can be used for communication by animals
- So, howling is used for communication by animals

- Howling is used for communication by animals
- A wolf is a kind of animal
- Therefore, howling can be used for communication by wolves

- A wolf is a kind of animal
- A warning is used to warn animals
- So, a warning can be used to warn wolves

- A warning can be used to warn wolves
- Warning is a kind of communication
- Hence, warning is a kind of communication that can be used to warn wolves

- Howling can be used for communication by wolves
- Warning is a kind of communication that can be used to warn wolves
- Therefore, howling is used to warn other wolves by wolves

- Animals usually keep away from danger or problems
- Warning can be used to indicate danger or problems
- So, warning can be used to keep animals away

- Warning can be used to keep animals away
- A wolf is a kind of animal
- Therefore, warning can be used to keep wolves away

- Howling is used to warn other wolves by wolves
- Warning can be used to keep wolves away
- So, howling is used by wolves to keep other wolves away

- Establishing a territory can require keeping other wolves away
- Howling is used by wolves to keep other wolves away
- So, howling is used by wolves to establish a territory

So, howling is used by wolves to establish a territory
Question: Which behavior can help animals establish a territory?
Context: - Howling is a kind of sound 
- Sound can be used for communication by animals 
- Animals usually keep away from danger or problems 
- Warning can be used to indicate danger or problems 
- A wolf is a kind of animal 
- A warning is used to warn animals 
- Warning is a kind of communication 
- Establishing a territory requires keeping other animals away