Three seed eating snow buntings have been seen about the park and beach. The large Buntings have striking snowy plumages with a sandy buff wash.
They are a scarce breeding species in the UK making them a rare Royal Society for the Protection of Birds Amber List species.
There are only 70-100 breeding pairs known in the UK October to March and they are located in Scotland.
Pembrey Country park chief ranger Gavin Hall said: “Because of the vast tidal ranges on the beach, Cefn Sidan can be seven-miles long when the tide is in but up to nine-miles when the tide is out because of its convex nature.
“Cefn Sidan, consequently is a fast dining table for many thousands of sea birds and we often have unusual birds turn up following periods of high winds.”