This morning this Mason bee (I couldn't find the real English name of the Mauernbiene) was crawling through our living room. I thought it would be better to go out side again and I moved her to the rockcress, which is already blooming.
Obviously I underestimated the cold. She didn’t move away until evening to look for a sheltered place. So I picked her up again. Now she's thawed and making havoc in her new, temporary home - a large jar. She has already managed to fall backwards into the drop of honey that I gave her to strengthen. I hope that it will get warm enough for her outside quickly and that she can get back into the great outdoors.