Wet Warblers

We sat in the Bittern hide as it was pouring with rain. I managed to shoot a couple of warblers in the reed bed. I think the one on the left is a reed warbler and on the right a sedge warbler. 

The hemlock is everywhere, in full bloom and about eight feet high. It smells very strongly mousy/musty. I felt nauseous. I wonder if it was the odour of this deadly poisonous umbellifer that made me feel sick?