Unknown pond life

Unknown pond life

Observation - Unknown pond life - UK and Ireland. Description: I have a very small pond and lately I hva notice some fast moving small creatures just below the sur

I have a very small pond and lately I hva notice some fast moving small creatures just below the surface of the water. They range in size from 2mm to about 7mm. They have what appears to be a large head and attach themselves to the surface via a tube. Sorry about the quality of the photos but it wasn't easy to photograph them. I have selected the habitat as Freshwater as the pond was filled exclusivly with rainwater