The unidentified 13ft-long blob stunned beach-goers, who were quick to take photos of the beast.
The mysterious creature found itself on Bonfil Beach, in the city of Acapulco, in south-west Mexico.
Rosa Camacho, coordinator the civil guard and fire brigade, said the animal had not been dead long but seemed to have rapidly started to decay.
She said: "We have no idea what type of animal this is, but I do know that it does not smell bad or have a fetid aroma."
It is understood the body was brought to shore by strong currents.
Photos of the discovery have been shared thousands of times online.
Some believe the creature is a type of giant squid and others think it is a whale.
Last month an "alien-type" creature compared to "something out of a sci-fi horror film” terrified fishermen and stunned scientists.
The internet went in to meltdown in November after a bizarre mutant creature was found in California.
(dailystar.co.uk)
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