Why does a rat chew hair? - briefly
Rats gnaw hair to wear down continuously growing incisors and to relieve stress or boredom, and the collected strands are often used for nest building.
Why does a rat chew hair? - in detail
Rats gnaw on hair for several physiological and behavioral reasons. Their incisors grow continuously; chewing provides the necessary wear to keep teeth at functional length. Hair, being fibrous and resistant, offers an effective material for this purpose.
Nutritional deficiency can also trigger hair‑gnawing. Lack of essential proteins, minerals, or fatty acids may lead rats to seek alternative sources of nutrients, and hair contains keratin, a protein that can be partially broken down in the gut.
Stress and boredom are additional drivers. In confined or unstimulating environments, rats exhibit oral stereotypies, including the consumption of non‑food items such as fur. Providing enrichment objects, nesting material, and opportunities for exploration reduces this compulsive behavior.
Parasitic irritation may contribute as well. External parasites or skin conditions cause discomfort, prompting rats to bite or chew their own or cage‑mate fur in an attempt to alleviate itching.
Key factors:
- Dental maintenance: constant incisor wear.
- Dietary insufficiency: seeking protein from keratin.
- Environmental stress: lack of stimulation leads to oral stereotypy.
- Dermatological irritation: parasite‑induced discomfort.