Bull and Calf Moose, Gros Ventre River, Wyoming

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This photograph shows a large bull moose meeting a moose calf near Wyoming's Gros Ventre River (pronounced "grow vaunt"). Moose are semi-aquatic, often wading to feed on aquatic plants and willows in summer. Moose often swim across rivers and even large lakes. While they may seem awkward moose are fast and powerful, and can be very aggressive when disturbed. Bulls weigh 840 to 1500 pounds (380–700 kg), are between 7.9 to 10 feet (2.4 to 3.2 meters) long, and stand up to 6.9 feet (2.1 meters) high at the shoulder. They are the largest extant species in the deer family and typically inhabit boreal and mixed deciduous forests in the Northern Hemisphere.