Leeches

""Land leeches to sportsmen and persons who frequent the damp jungles of the interior, are the greatest pests in Ceylon. Leech-gaiters, which keep the others off, are of little avail against them, as they climb up your body and get inside your clothes; besides, they can spring on you from among the leaves.""

Could be an annoyance and worth thinking about, wearing shorts might not be a great call

http://www.lakdasun.org/tools-tips/leeches-preventive-socks-repellents-treatments.htm
making you own leechsock