Jean Roberts sighted a female Mandarin Duck (Aix galericulata) on the
2nd October in the morning on the river. She says: There are sometimes 20 or more at Allestree Lake where they hide under branches and perch on low branches. Also Bradley Dam has a lot. They are Feral only appearing in the wild in 20th century.
Find out more about the mandarin by visiting the RSPB website and Wikipedia.