1. Nesting behavior: This is the most likely reason. Hamsters are naturally inclined to build nests for comfort and security. They'll gather bedding, shredded paper, or other soft materials to create a cozy spot to sleep, hide, and raise young (if they are female).
2. Hiding food: Hamsters are also known to hoard food. They may bury food within their bedding pile to keep it safe for later.
3. Marking territory: While not as common as the previous two, hamsters can also use bedding piles to mark their territory. They may urinate on the pile, leaving their scent.
4. Boredom or stress: If your hamster is constantly building large bedding piles, it could be a sign of boredom or stress. They may be lacking enrichment or stimulation in their cage.
Here are some things you can do to encourage healthy nesting behavior:
* Provide plenty of bedding: A good rule of thumb is to provide enough bedding for your hamster to burrow completely.
* Offer nesting materials: In addition to bedding, provide your hamster with soft materials like shredded paper, tissue paper, or even fleece scraps to build their nest.
* Consider a hideout: A small hideout or tunnel can provide a safe and private space for your hamster to build their nest.
* Ensure adequate enrichment: Make sure your hamster has plenty of toys, wheels, and other activities to keep them entertained and stimulated.
Important note: If your hamster is building large piles of bedding consistently, or if you notice any other unusual behaviors, it's always best to consult with a veterinarian to rule out any underlying health issues.