The whale was discovered in an area of forest in the coastal zone of the Inverness municipality of Soure, on the island of Marajó, Pará State in Brazil.
According to the City Department of Environment, the animal, which seems to be an individual adult, was dead when it was discovered on Friday.
It measures 11 meters long by 6 meters wide.
And experts said they do not know how the animal – whose natural habitat is the saltwater Ocean – ended up in the forest.
But people were quick to offer suggestions.
One said: “Probably milirary sonar.”
While another joked: “Blame the aliens.”
A third added: “Looks like foul play.”
But one explained: “It’s a mangrove swamp, the whale was dead and was washed in on an exceptionally high tide, the only thing the article states is that they don’t know what killed it as there is nothing to indicate the cause of death.”
The NGO water Animal biologists are on their way to verify the cause of death of the animal.
“They’re going to do the autopsy.
“To the naked eye, no injuries.
“To the naked eye, no injuries”
“So we need to understand what culminated in the death of the whale,” said Katie Silva, Secretary for Environment.
The humpback whale is one of the largest mammals on the planet, growing up to 52ft long and can weigh between 25 and 30 metric tons.
They usually migrate up to 16,000 miles every year – feeding in polar waters and then moving to warmer waters to breed and give birth.
Despite their huge size their diet is mainly krill and small fish.