Caption
Duck Leech (Theromyzon tessulatum) waiting and ready to crawl up the nostrils of a duck to suck blood from its respiratory tracts, reaching out from a Delicate stonewort (Chara virgata) alga in a shallow pond, with eggs carried in a ventral sac; this leech can cause birds to suffocate and can transmit diseases, Wiltshire, UK, September.
Availability
Only inBelgium, Canada, France, Luxembourg, Switzerland