Traits

Round, long feelers that hang down a leech's face.

They occur most commonly in pets and wild class. Occasionally these ears develop with a slight amount of fat or cartilage, allowing them to stand on end, but the leech cannot otherwise move them. 
They have less sensory input than most feelers and ears, and as a result a leech can sometimes be seen chewing on them as some sort of comfort or stress relief.