OMG! Rat's head found in McDonald burger, outlet shut
However, the fast food chain denied the allegations claiming it was an extortion bid by the customer, EFE news reported.
McDonald's spokesperson Felix Ramirez told 'El Universal' newspaper that the incident will be investigated but did not rule out the possibility of an extortion attempt by the consumer.
"We are trying to find out what happened; it is something that was planted; it is impossible that something like that could be served at one of our restaurants," he said.