The term 'Littoral Fliers' refers to a type of seabird known as the ERNS, which stands for 'European Riverine Nightjar Species'. These birds are found in coastal areas and estuaries, and they are known for their long-distance migrations. They are also known for their distinctive call, which is a loud, repetitive 'churr' sound. The ERNS is an important species for conservation efforts, as it is considered to be vulnerable to extinction due to habitat loss and other human-induced pressures.