The common blackbird (Turdus merula) is a species of true thrush found throughout much of the world, though known under a variety of names. These omnivorous birds eat a wide range of insects, earthworms, berries, andfruits.The common blackbird (Turdus merula) is a species of true thrush found throughout much of the world, though known under a variety of names. These omnivorous birds eat a wide range of insects, earthworms, berries, andfruits.