Aix (x Mareca, Anas, Spatula, Aythya, Netta, Lophodytes, Bucephala, Marmaronetta, Amazonetta)

Wood Duck x Chiloe Wigeon (Aix sponsa x Mareca sibilatrix)

Media:

📷 (From: https://www.backyardchickens.com)

https://www.inaturalist.org/observations/215264917

https://macaulaylibrary.org/asset/630053328

Wood Duck x Mallard (Aix sponsa x Anas platyrhynchos)

Males often with partial Wood Duck-like crest and overall Mallard-like body pattern. Bill intermediate in shape. Females often subtler with an intermediate overall shape, particularly noticeable in the head and bill. Eye usually dark to brown. Individuals involving a domestic Mallard parent can cause some confusion.

Most similar to Wood Duck x Aythya/Netta. The latter tend tend to have pale or red eyes, often darker back, and overall different body pattern. They also often have a more bluish-silvery bill.

Media:

https://macaulaylibrary.org/asset/38423091

https://macaulaylibrary.org/asset/280918711

https://macaulaylibrary.org/asset/280918641

https://macaulaylibrary.org/asset/315404361 - Apparently domestic-type

https://macaulaylibrary.org/asset/48976041 - Apparently domestic-type

Status

Exists in the wild in North America and as an escapee in Europe and presumably worldwide.

Wood Duck x Silver Teal (Aix sponsa x Spatula versicolor)

Media:

https://ebird.org/checklist/S295644723

📷 (From: https://www.backyardchickens.com)

Wood Duck x White-cheeked Pintail (Aix sponsa x Anas bahamensis)

Information:
Media:

https://www.inaturalist.org/observations/148244110

Wood Duck x Northern Pintail (Aix sponsa x Anas acuta)

Information:
Media:

📷

https://www.inaturalist.org/observations/101653605

https://www.inaturalist.org/observations/102057577

Wood Duck x Chestnut Teal (Aix sponsa x Anas castanea)

Information:
Media:

📷 (From: https://www.backyardchickens.com)

Wood Duck x Blue-winged Teal (Aix sponsa x Spatula discors)

Information:
Media:

📷 (From: https://www.backyardchickens.com)

Wood Duck x Greater Scaup (Aix sponsa x Aythya marila)

Information:
Media:

Wood x Ring-necked Duck (Aix sponsa x Aythya collaris)

Information:
Media:

📷 https://www.basducks.com/Wood-Duck-Ring-Bill-Hybrid-Duck-p/wood-ring.htm

Wood Duck x Common Pochard (Aix sponsa x Aythya ferina)

Information:
Media:

📷

Wood x Tufted Duck (Aix sponsa x Aythya fuligula)

Information:
Media:

📷

Wood x Ferruginous Duck (Aix sponsa x Aythya nyroca)

Information:
Media:

📷 (https://www.backyardchickens.com)

📷

Wood Duck x Rosy-billed Pochard (Aix sponsa x Netta peposaca)

Information:
Media:

📷

Wood Duck x Red-crested Pochard (Aix sponsa x Netta rufina)

Information:
Media:

📷 (https://www.backyardchickens.com)

📷

https://www.inaturalist.org/observations/305167032

Wood Duck x Hooded Merganser (Aix sponsa x Lophodytes cucullatus)

Information:
Media:

https://macaulaylibrary.org/asset/126724631

https://macaulaylibrary.org/asset/131564491

📷

Wood Duck x Bufflehead (Aix sponsa x Bucephala albeola)

Information:
Media:

Wood x Falcated Duck (Aix sponsa x Mareca falcata)

Information:
Media:

📷 📷 - https://harteman.nl/hybrids

Wood x Marbled Duck (Aix sponsa x Marmaronetta angustirostris)

Information:
Media:

https://www.inaturalist.org/observations/230525546

📷

Wood x Red-billed Duck (Aix sponsa x Anas erythrorhyncha)

Information:
Media:

📷

Mandarin x Laysan Duck (Aix galericulata x Anas laysanensis)

Information:
Media:

📝 - This seems to be the most credible evidence for any hybrid involving Mandarin Duck. All other alleged Mandarin Duck hybrids that I've come across either don't have any credible evidence or, in the case of Mandarin x Wood Ducks, are just eclipse plumage male Mandarin Ducks. No other Mandarin Duck hybrids in the linked paper seem to actually be Mandarin Duck hybrids.