Feeding wild animals in their natural habitat may seem like a caring gesture, but in reality, it causes them enormous harm. This applies not only to deliberately leaving food out, but also to throwing leftovers into the forest – even individual cores, eggshells, or other "natural things that will decompose."

Winter is the most difficult time of year for animals. Temperatures are low, days are short, and access to food is limited. But animals have developed various strategies to survive until spring. How do they cope?

According to folk legend, animals can speak with a human voice on Christmas Eve. Most people take this legend with a grain of salt, arbitrarily assuming that animals don't speak. However, recent research on whales suggests that perhaps, at least when it comes to speech, the line between us and animals isn't as clear as we once thought.

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?