Beautiful Röhn part II

One of the reasons I wanted to visit the Röhn area was to catch* the Clouded Apollo before becoming extinct in this area. I only knew two higher locations but as the temperatures were low before our trip the chance to find them was low. I learned that there was a secret kept location on a lower part but I really didn't know where. The first days after arrival I visited the higher locations but there was no sings of a Clouded Apollo or any other butterflies.
Long story short....after one week I found a good clue on the internet and finally I found the place with at least 10 flying Clouded Apollos! And as icing on the cake one Clouded Apollo was sitting on a flower near the path.

Parnassius mnemosyne - Clouded Apollo - Röhn

I was very happy and started to photograph this butterfly but after a few minutes I noticed that something was wrong. Although the butterfly was drinking nectar he could not fly. I walked around and when I came back he was still sitting on that flower....not a good sign but fortunately there were some other Clouded Apollo's flying around.

The next day I returned and this butterfly was still sitting next the path and on the path I found a dead fresh Clouded Apollo....not a good sign! I placed the butterfly on an other flower and he immediately started drinking. I guess that the area has too few nectar plants that some butterflies are starving. 
Although I found this rare species I was not in happy mood and I guess that they will disappear if nothing happens.