BIRD WHISTLES: Great whistle to imitate bird calls deceptively real. The bird whistle is packed in a soft cotton bag with a drawstring. The small flyer contains a short portrait of the bird and the multilingual instructions in German, English, and French. BIRD CALL WHISTLES: The bird call whistles are the ideal pastime - even for children. With a little practice, they too are able to imitate bird calls true to nature with the whistles. Blackbird, thrush, cuckoo, nightingale, duck, tit, lark are just a selection of the over 20 available versions.; SUSTAINABILITY. We use natural materials for our toys whenever possible, preferably wood from European cultivation, thus helping to conserve resources.