The Department of Natural Resources reminds those enjoying Michigan's waters to stay clear of mute swans, especially those with young.

"Mute swans can be aggressive, particularly when protecting nests or young," said Joe Robison, DNR acting waterfowl specialist. "Young swans, called cygnets, typically hatch in May and are not able to fly until August. During this period, adult mute swans have been known to attack humans, dogs and watercraft in an attempt to protect their young."

Adult mute swans have large white bodies, weigh 20-30 pounds and have wingspans up to seven feet.

Mute swans are the most common swan species on Michigan lakes and streams in summer. The species was introduced to the United States and competes with native waterfowl for food and territory. Mute swans can be distinguished from native swans, which do not have the same negative impacts on other waterfowl and habitats.

"Mute swans can be identified by red or orange coloring on the bill. In contrast, the rare trumpeter swan has an entirely black bill and does not typically behave aggressively toward humans." Robison said.

Swans feed on aquatic plants by dipping their long necks beneath the water to graze. This feeding pattern places swans in the same waters where people enjoy boating, swimming and other recreation activities. Please keep an eye out for swans and give them plenty of space.