Researchers are having a whale of a time trying to figure out how a humpback whale wound up in the Amazon rain forest.

The whale, believed to be a calf, was found on Friday on the Brazilian island of Marajo. It was about 50 feet from the ocean, according to Newsweek .

Darlene Silva, a spokeswoman for Brazils Department of Health, Sanitation and Environment, told reporters the animal was found in a mangrove swamp only after researchers noticed vultures circling in the sky, according to the Express .

Biologists from the Bicho Dgua Institute said the animal was about 26 feet long, though local officials said it was closer to 36 feet long, according to Storyful.

A team from the Municipal Secretariat of Health, Sanitation and Environment found the carcass had no visible injuries and theorized that the whale died at sea.

HuffPost reached out to the Bicho Dgua Institute, which did not immediately respond but said in a Facebook post that the animal was not as big as it looks in the images.