The Cryodraconidae are a very rare group of northern dragons. They have special hollow, elongated scales that cover most of the body. But to survive, the hard winter they must travel in to the south were the temperature are a bit higher. Dragons are warm-blooded creatures but the big wings are escape the heat of the body, so a flying Cryopterus in the winter is a rare sight.
Maybe this inactivity is a reason for the nearly extinction of dragons in europe.
The population in denmark is the smalest because of the high number of dragonslayer in the middleages.
This species only all 2 years lay an egg. The males fight with their tales (you can see the grains). The winner often get more than one female and build with every nest. After the winter the babys hatch.