This March 2013 image provided by the US Attorney's Office shows Totoaba bladders displayed at a US border crossing in downtown Calexico, Mexico. Seven people have been charged in a scheme to sell the bladders of an endangered Mexican fish considered a delicacy for use in Chinese soup, US prosecutors said Wednesday.

A member of the Philippine Coast Guard, left, talks to Chinese fishermen aboard their vessel on April 9, 2013.

A protester donning a snorkel and holding placards attends a rally in front of the Chinese consular office in the financial district of Manila on April 10, 2013, after a Chinese fishing vessel ran aground off Tubbataha reef, around 1,000 miles from China's nearest major landmass.

A Kenya Wildlife Service warder inspects a section of elephant tusks. Police in Kenya have seized two tonnes of ivory worth $1.15 million, the biggest haul on record in the East African country.

A worker arranges elephant tusks recovered from a container on transit, at the Kenyan port city of Mombasa on Jan15.

Tourists watch a one-horned rhinoceros inside the Kaziranga National Park, a wildlife reserve that provides refuge to more than 2,200 endangered Indian one-horned rhinoceros, in the northeastern Indian state of Assam.

A one-horned rhinoceros stands inside the Kaziranga National Park.

A two-and-half-month old male orphan one-horned rhinoceros calf rescued during recent floods walks at a rehabilitation center inside the Kaziranga National Park.

A one-horned rhinoceros wades in water as a forest guard stands nearby inside the Kaziranga National Park.

A rescued baby pangolin is released in the forest by government wildlife and conservation officer in Karo district located in North Sumatra province on July 31, after Indonesian police intercepted 85 endangered pangolins, most of them alive despite being stuffed into sacks by suspected smugglers. The animals, also known as scaly anteaters and prized mostly in China and Vietnam as food and medicine, were crammed into 14 sacks when they were seized at a bus station in the city of Medan in North Sumatra province on July 28, said Yoris Marzuki, chief detective of the local police.

Seized pangolins are held in plastic crates in Medan city on July 31. Indonesian police have intercepted 85 endangered pangolins, most of them alive despite being stuffed into sacks by suspected smugglers, an official said on July 31.

A rescued pangolin is released in the forest by government wildlife and conservation officers in Karo district located in North Sumatra province on July 31, after Indonesian police intercepted 85 endangered pangolins, most of them alive despite being stuffed into sacks by suspected smugglers. The animals, also known as scaly anteaters and prized mostly in China and Vietnam as food and medicine, were crammed into 14 sacks when they were seized at a bus station in the city of Medan in North Sumatra province on July 28, 2012, said Yoris Marzuki, chief detective of the local police.

A just-revived elephant tries to stand back up after it was sedated for collaring.

Game park workers restrain a rhinoceros to saw off her horn at the Kragga Kamma Game Park on March 30 in Port Elizabeth, South Africa. Horns are being removed from rhinos in an attempt to prevent the rhino from being poached and its horn sold on the black market.

Veterinarian William Fowlds saws off the horn of a rhinocerous while game ranger Mof Swanepoel restrains her at the Kragga Kamma Game Park on March 30 in Port Elizabeth, South Africa.

Veterinarian William Fowlds, game park co-owner Mike Cantor and game ranger Mof Swanepoel treat the wounds of a rhinoceros after sawing off its horns at the Kragga Kamma Game Park on March 30 in Port Elizabeth, South Africa.

A rhinoceros whose horn has been removed grazes with its young at the Kragga Kamma Game Park on March 30 in Port Elizabeth, South Africa.

Two male Rhinoceros lock horns playfully while pasturing in the savanah at the Lewa Wildlife Conservancy on Dec. 10.

Three park rangers look through their binoculars while sitting in the shade of a tree at the Lewa Wildlife Conservancy in central Kenya on Dec.9.

The carcass of a Rhino shot dead by poachers and later scavanged by wild animals lies on the ground at the Lewa Wildlife Conservancy in central Kenya on Dec. 9.

John Pameri, head of the security at the Lewa Wildlife Conservancy in central Kenya, holds a Rhino tusk his team took from a Rhino that was shot dead by poachers earlier in the week, at the security headquarters on Dec. 9.