Tundra reindeer, red deer, and caribou are the same species, classified by zoologists as Rangifer tarandus. This extraordinary animal is perfectly adapted to living in harsh climatic conditions, which is why they can be found in the Arctic tundra and forest tundra of Eurasia and North America. Their thick fur protects them from the cold, and their wide hooves prevent them from sinking into the snow and allow them to walk smoothly across it.

The question is somewhat provocative, because of course they are blue—but not in the sense we imagine when buying paints at the store. Their wings don't contain any blue pigment. So how is it possible for them to shine with such an intense hue?

While the topic may raise a smile, it's worth taking seriously, as the color of our feces is determined by specific physiological processes. Their brown hue is no coincidence – it's the result of the work of our liver, intestines, and the bacteria living in our intestines.

Why are some cats black, others brown, gray, ginger, or white? Why can you tell a male from a female by their coat? Or is every white cat an albino? If you're curious, we invite you to read the text below.

Why are some cats black, others brown, gray, ginger, or white? Why can you tell a male from a female by their coat? Or is every white cat an albino? If you're curious, we invite you to read the text below.