Plants and animals that thrive in temperate climates are found in the Netherlands. The most common trees are oak, elm, pine, linden, and beech. The country is famous for its flowers, both cultivated varieties (best known among them the Dutch tulip) and wild flowers such as daisies, buttercups, and the purple heather that blooms on the heaths in September. Birds are those characteristic of Western and Central Europe, with large numbers of seagulls swarming over the coastal areas from time to time. Many kinds of fish abound along the North Sea coast and in the lakes and rivers. Wild or large animals are practically nonexistent.