This is thought to provide protection from predators such as sparrowhawks and hobbies. Birds such as crows, sparrowhawks and quails can also be found. Eurasian sparrowhawks are also popular in Ireland. The main predators of the garden warbler are Eurasian sparrowhawks and domestic cats. One interesting use of the Sparrowhawks was to act as 'flying ballast'. Other predators of the pigeon have been recorded, including sparrowhawks, crows and seagulls. His advice to Queen Victoria was "Sparrowhawks, ma'am". Black sparrowhawks prey primarily on mid-sized birds. Most of the Old World members of the genus are called sparrowhawks or goshawks. Other nest builders in Europe can often include common wood pigeons and Eurasian sparrowhawks. The large and widespread genus "Accipiter" includes goshawks, sparrowhawks, the sharp-shinned hawk and others. Studies of racing pigeon deaths found that Eurasian sparrowhawks were responsible for less than 1%. Like other birds of prey, Eurasian sparrowhawks produce pellets containing indigestible parts of their prey. Sparrowhawks tend to fly in a frequently flapping, fluttering type flight.