Why have they been so successful?
To start off, the temperature of North American is similar to the climate of the Mute Swan's origin. And even if it wasn't, Mute Swans are very adaptable to their surroundings. They can live in open country, cities, lakes, estuaries, or ponds. They can also eat food found in water and on land. Also, Mute Swans have high longevity allowing them to live up to 10-19 years.
Mute Swans are also very assertive so they are able to establish populations in new areas quickly. Their aggressive behavior, hostile territoriality, and size allow them to out-compete many other native birds and reduce the predation rate. Also, the Mute Swans have no natural predators, so their population can continue to increase without many obstacles.
Mute Swans are also very assertive so they are able to establish populations in new areas quickly. Their aggressive behavior, hostile territoriality, and size allow them to out-compete many other native birds and reduce the predation rate. Also, the Mute Swans have no natural predators, so their population can continue to increase without many obstacles.