Bull in a meadow near Waiuku on North Island in New Zealand

Bull in a meadow near Waiuku on North Island in New Zealand

Bull in a meadow near Waiuku on North Island in New Zealand

Bull walking among trees in Queensland, Australia

Bull Ray (Aetomylaeus bovinus), Tenerife, Canary Islands, Spain

Musk Ox (Ovibos moschatus), bull in winter, Dovrefjell-Sunndalsfjella-Nationalpark, Norway

One large bull African elephant, Loxodonta africana, grassland, Masai Mara, Kenya

Camargue bull in the sansouire in autumn, Camargue, France

A bull Elephant (Loxodonta africana) crosses the valley in the Maasai Mara, Kenya.

Musk Ox (Ovibos moschatus), bull in winter, Dovrefjell-Sunndalsfjella-Nationalpark, Norway

Musk Ox (Ovibos moschatus), bull in mountains, winter, Dovrefjell-Sunndalsfjella-Nationalpark, Norway

Musk Ox (Ovibos moschatus), bull in winter, Dovrefjell-Sunndalsfjella-Nationalpark, Norway