Supplementary videos

• Medicinal leech (NOVA scienceNOW)

Extra credit readings

• How Box Jellyfish Avoid Banging Into Things ScienceDaily 4/2/07
• Ligula intestinalis a tapeworm contraceptive Biologist Dec 02
• The humble leech's medical magic BBC News Online 7/2/04
• Leech rides the tunnel of love New Scientist 2/11/95
• Gullible male fireflies supply 'femmes fatales' with a lifesaving chemical Cornell U. Sep 1, 97

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