Pete Oxford / Huaorani indian prepares darts for blow gun, indigenous rainforest tribe, Napo Province Ecuador

Mark Moffett / Golden Poison Dart Frog (Phyllobates terribilis) group used by Embera Choco Indians to poison their darts for hunting, Colombia

PREMAPHOTOS / Edible snails courtship / mating (Helix pomatia) UK. In the mating season, all snails are male, exchanging sperm by hypodermic insertion of "love darts". Later on, the snails become female and fertili...

Mark Moffett / Embera Choco people use a distinctive kind of blowgun and secretion from Golden Poison Dart Frog (Phyllobates terribilis) to poison on their darts for hunting, Colombia

Mark Moffett / Golden Poison Dart Frog (Phyllobates terribilis) used by Embera Choco Indians to poison their darts for hunting, Colombia

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) researchers Lea Gerber and Dr James Darling shoot biopsy darts at whales with dart bouncing off whale unnoticed, carrying a sample of fat and skin in the tip, A...

Mark Moffett / Dr Mark Moffet at right getting a close look at Golden Poison Dart Frog (Phyllobates terribilis) captured by Embera Choco Indians to make poison-tipped darts, Colombia

Alex Hyde / Love dart of Brown-lipped snail (Cepaea nemoralis), resembling spear heads, love darts are formed internally and stored in a dart sac before deployment during courtship, Cressbrook Dale, Peak District...

Jeff Foott / Men playing with wooden darts known as khuru, played during festivals. Bhutan. September 2013.

Jeff Foott / Men playing with wooden darts known as khuru, played during festivals. Bhutan. September 2013.