The announcement was welcomed by conservationists, who, citing its detrimental impact on wildlife, have long been pushing for an all-out ban.
More than two tons of ivory were crushed, in a country renowned for being a hub for illegal tusks.
The Minnesota man paid $50,000 for the hunt.
A genetically engineered yeast could be used to churn out morphine, codeine and other opiates using a simple home-brew beer kit.
As the country faces a seventh straight yearly increase in rhino poaching, a panel of experts is studying an unusual proposal to battle the problem.
Popular resident of Tsavo National Park in Kenya had tusks so big they were recognizable even from the air.
Undercover video footage shows workers cutting up the large dotted back fins of whale sharks.
Ivory has replaced blood diamonds as a major source of cash for criminal armies.
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