The cornflower has grown on Estonian soil for more than 10,000 years, from the time when the first humans came to Northern Europe. The plant grows commonly in rye fields, creating a strong connection in the minds of Estonians between the flower and their daily bread. The blossoms of the cornflower have a particularly striking graphic appearance which has led to its use by artists for decorative purposes.
The barn swallow, the national bird, is a characteristic guest of Estonian homes. Its call can be heard from practically every eave or barn rafter in the country. If the bird finds a suitable opening, under the ridge of a roof or a broken window, it will build its cup-shaped nest; it will even build it inside a house.
Estonian national stone is the country's valuable grey limestone. Estonia lies on a thick layer of limestone which is visible on the steep banks of northern and western Estonia. Most castles, churches, farm buildings, and countless stone fences are made of limestone. Research on limestone and its well-preserved fossils has for centuries brought Estonian scientists international renown. (source)