The rare "Buffus Cereleus" Costa Rican pygmy blue tree frog secretes one of the most potent poisons known to man. Diluted to one part per hundred thousand, it is still fatal. One frog could be milked for enough venom to kill the entire population of a city of a million. Fortunately the tiny frog is believed to be extinct in the wild, with the only known colony surviving in the National Biological Garden in Baghdad.