I'm in the process of designing a more functional "hood" to block UV / sun exposure and also provide shelter from rain. I believe that the best gear and products are developed by "looking to nature" for inspiration. Therefore, what solutions exist in nature to reduce the amount of UV / sun exposure or provide shelter from rain?
I am specifically (though not exclusively) interested in mimicking any hood-like features that animals exhibit, or any natural means of blocking the UV rays/sun such as the way trees in the rain forest create a natural canopy (perhaps less obvious examples will generate more inspiration). Are there are any other means of reducing UV/sun exposure or offering shelter from the rain?
Hoping to gain some inspiration here.