This image shows some of the plastic bags that were found in the stomach of the whale during an autopsy in Songkhla province, in southern Thailand.
The whale was described as "emaciated" and had struggled to eat because its stomach was so full of plastic.
A veterinary team tried "to help stabilize its illness but finally, the whale died" on Friday afternoon, the post said.
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Jatuporn Buruspat, head of the department, said the whale probably thought the floating plastic bags were food.
"This plastic rubbish made the whale sick and unable to hunt for food", the department said.
A whale has died after swallowing 80 plastic bags in southern Thailand.
Thon said at least 300 marine animals including pilot whales, sea turtles and dolphins, perished each year in Thai waters after ingesting plastic.
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Pilot whales mainly feed on squid, but are known to eat octopus and small fish when squid are not available, according to the American Cetacean Society, a whale conservation group.
Each year, Thailand puts over one million pounds of garbage into the ocean, making it one of the biggest offenders on earth, along with China, Indonesia, the Philippines and Vietnam.
The whale's death comes as dozens of cities and companies worldwide are moving to crack down on plastic pollution by banning the use of non-reusable plastic containers, bags and drinking straws.
It was unclear whether the whale was a short-finned or long-finned pilot whale, although short-finned pilots commonly traverse the warmer waters typical of Southeast Asia.
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In April, a 33-foot sperm whale weighing almost 15,000 pounds was found dead on a Spanish beach.