Some years back we went on a trekking through the coffee plantations in Western Ghats (Lower Palani Hills range). After returning back to our residence, we noticed that each one of us having a black sac-like thing on our legs! Blood was oozing out from that spot. We had been bitten by Leeches (Haemadipsa sylvestris, Indian Leech, Terrestrial Leech, 'Attai' in Tamil).
