Birds by sea cliffs is a term used to describe two species of birds that can be found near coastal areas. The first species is the Erne (5 letters), which is a large seabird with a wingspan of up to 6 feet and a white head and neck. The second species is the Tern (5 letters), which is a smaller seabird with a wingspan of up to 3 feet and a black cap on its head. Both species are known for their graceful flight and can often be seen soaring along the cliffs of the coast.