Polar wolves always keep their tail in a downward position.
If the tail is raised, it means that you are facing the leader of the pack. By the way, in a similar way, hyenas express their social status within the pack.
There are reindeer with glowing antlers in Finland.To prevent reindeer from being hit by cars, their antlers are painted with a special spray of reflective paint.
Examination of even a single hair can establish whether a person had drugs or other powerful substances in his blood, as well as what he had eaten recently.