Great news everyone! The trumpeter swans (Cygnus buccinator) have arrived in the Arboretum. Trumpeter swans are North America's largest bird and the world's largest waterfowl. I saw two adults and two juveniles feeding down in the Huron River just a few minutes ago.
The native trumpeter swan can be distinguished from the invasive mute swan but the color of its bill: trumpeter swans have a black bill; mute swans have an orange bill.