'Both female and male reindeer have antlers, which is unique amongst deer species' | gsc1 ✍️
In the Arctic, this change is more extreme: the temperature can drop to a nippy minus 30C, and sunlight remains absent from this frozen landscape for five months of the year. There are few animals that can survive these harsh conditions, but one has adapted in several surprising ways to thrive in the extreme cold and prolonged darkness.
It turns out this is quite a unique ability, as very few species of animal are known to use UV vision in this way. UV light is beyond the range of human vision. Scientists discovered another reindeer revelation in 2013. They found the wavelength of light reflected from the back of their eyes changes with the seasons. In summer, when their environment is bathed in sunlight, their eyes reflect more golden wavelengths of light. In winter, their eyes reflect more deep blue wavelengths. This happens as their eyes become more sensitive to the light levels of the season.
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