A McDonald's Sausage McMuffin burger which a customer claimed to contain a baby lizard has been sent to a laboratory for testing.
The fast-food chain sent an employee down to the customer's home on Wednesday night to collect the food sample.
Results from the lab are expected "within the next few days", said McDonald's Restaurants senior communications manager Kevin Lim.
"Food safety is our top priority and we take all feedback relating to the quality of our food very seriously."
The customer, known only as Sandy Sand on social networking site Facebook, posted a photograph of the half-eaten burger on the fast-food chain's Facebook page on Wednesday at noon.
It had what looked to be the tail of a lizard sticking out of it, she claimed, adding that the burger was bought from the Ang Mo Kio drive-through branch.
McDonald's has apologised to the customer for her experience.
The photo post has been shared over 500 times on Facebook as of yesterday evening. Numerous threads have also popped up on online forums like hardwarezone.com.sg, questioning if the burger actually contained a lizard.
The customer could not be reached for comment. But in several posts on the McDonald's Singapore Facebook page, she said: "Thanks to McDonald's for (its) attention and sending (its) personnel over at this hour to collect it for analysis."
She added that she hoped "an upright judgment will be announced" and wrote: "Thanks for the prompt action but no thanks for the unforgettable awful experience."