Which factor is NOT typically considered when selecting housing conditions for rodents?

• A. Temperature
• B. Humidity
• C. Cage color
• D. Light cycle

Answer: (C)

Housing conditions are guided by factors that directly affect a rodent’s physiology and welfare. Temperature, humidity, and the light cycle each influence critical biological processes: temperature governs thermoregulation and comfort, humidity affects respiratory health and skin condition, and the light cycle shapes circadian rhythms and daily activity. Cage color, on the other hand, does not alter these physiological or behavioral drivers under standard housing conditions, so it isn’t used to determine appropriate housing. It might matter for practical reasons like labeling or visibility, but it doesn’t impact health or welfare in typical scenarios.