Hamsters can be exposed to the sun, but you need to pay attention to the duration and the way of sun exposure.
Proper sun exposure for hamsters can promote bone development and the absorption of calcium substances. However, a shaded area must be provided to prevent hamsters from suffering heatstroke or getting sunburned. Nevertheless, long-term exposure to the sun can have a serious impact on the health of hamsters. Hamsters have very thin skin and are prone to sunburn, which can lead to redness, inflammation, and blistering of the skin. In addition, hamsters' eyes cannot adapt to strong light, and direct exposure to the sun may cause damage to their eyesight or even lead to blindness. Hamsters are very sensitive to temperature, and exposure to the sun can easily cause their body temperature to rise too high, resulting in heatstroke, which can be fatal to them.
In winter, although it is okay to let hamsters bask in the sun properly to keep warm, it is necessary to ensure that there is a shaded area and avoid direct sunlight. You can lay more bedding materials or cotton in the cage to help the hamsters keep warm. At the same time, good ventilation should also be ensured to prevent hamsters from getting sick due to improper warming measures.