The sea-mew is an aquatic bird, more modernly called a “sea-gull” or even simply a “gull”. In medieval thought, it was a symbol of hope, because hearing its cry told lost sailors that land was near. The sea-mew is a period charge, found (blazoned semew) in the arms of Sayer c.1460 [RH].
Despite its name, the sea-mew is not a sea-monster in the heraldic sense: the term refers to the natural bird, not a fish-tailed hybrid. The sea-mew is close by default.
The Province of Southern Shores bears: Per bend azure and Or, a sea-gull volant bendwise argent and a laurel wreath vert.
Togashi Kihō bears: Azure, a sea-mew volant argent, on a chief wavy Or three oak leaves sable.
Elsa Taliard bears: Per fess wavy argent and azure, two sea-gulls counterchanged.