Another strange larvae

Another strange larvae

Observation - Another strange larvae - UK and Ireland. Description: There is a puddle in North Quarry, Malvern which never dries up... presumably connected to a spring

There is a puddle in North Quarry, Malvern which never dries up... presumably connected to a spring somewhere ?
Its rich with life, various larvae, wasps drinking, lots of semaphore flies buzzing around and a dragonfly nearby most days.