Misc: Name the only Central American country without an Atlantic coastline?

Questions

Cuba is the only island in the Caribbean to have a---------- .?

Cyprus has a ---------- on its flag.?

Despite a population of over a billion, China has only about ---------- family names.?

Devon is the only county in Great Britain to have ---------- coasts.?

---------- , Mexico, Zambia, Kiribati, Fiji and Egypt all have birds on their flags.?