Garganey Spatula querquedula x Blue-billed Teal Spatula hottentota hybrid
Both species were formerly placed in the genus Anas and Blue-billed Teal was formerly known as Hottentot Teal.
Blue-billed Teal is not common in captivity so this is a very unusual hybrid.
captive Garganey x Blue-billed Teal hybrids, private collection at Wereham (Norfolk, UK), 5th May 2017
For comparison, here are photos of the parent species.
Garganey, Bintree Mill (Norfolk, UK), 22nd April 2023 and Blue-billed Teal, Lake Chilwa (Malawi), 26th September 2008
For more photos of these species follow the links below: