An often subtle Mareca hybrid. Males with gray body and pale hip patch, often darker than pure EUWI. Head sometimes rusty. Wing pattern intermediate with less white on coverts than EUWI and more in secondaries.

Similar to Gadwall x American Wigeon but often with a more orangey head, grayer body, and lacking any strong greenish coloration. Because of Gadwall influence, both of these hybrids can show a black border at the base of the bill. It is usually fairly safe to assume wigeon parent by range.

Media:

https://macaulaylibrary.org/asset/279651621

https://macaulaylibrary.org/asset/279651561

An often subtle Mareca hybrid. Males with grayish body that often has a pinkish/brownish wash throughout. Pale hip patch, often darker than pure AMWI. Head sometimes with green stripe (often less vibrant than on AMWI). Wing pattern intermediate with less white on coverts than AMWI and more in secondaries.

Similar to Gadwall x Eurasian Wigeon but often with a drabber head, more pinkish body, and sometimes greenish stripe on head. Because of Gadwall influence, both of these hybrids can show a black border at the base of the bill. It is usually fairly safe to assume wigeon parent by range.

Media:

https://macaulaylibrary.org/asset/190023431

https://macaulaylibrary.org/asset/647142094

https://macaulaylibrary.org/asset/250761681

https://macaulaylibrary.org/asset/646761347

📷- Top: Gadwall, Bottom: American Wigeon, Middle: Hybrid (http://hybridduck.blogspot.com/p/hybrid-gallery.html)

Males usually with variably pinkish flanks and wings; grayer than on AMWI. Sometimes black border to bill base. Head washed rusty usually with trace of AMWI pattern. Females significantly more subtle and are likely often not identifiable.

Most similar to either parent species, but beware in particular EUWI that occasionally have green masks. Molting males can also have rufous flanks, but those of EUWI are splotchy and messy when compared to the even wash on hybrids.

Media:

https://ebird.org/checklist/S34201929#x00421

https://macaulaylibrary.org/asset/132253851

Males have variable head patterns, but usually have some degree of paleness on the cheek. Pale area orangey and often split in two by a dark "tear streak". Bill dull yellowish to pinkish to blue. Long tail as on EUWI, gray body, and paler breast than on MALL. Intermediate head shape and wing pattern; pale wash on coverts where white patch is on EUWI, white speculum border as on MALL. Females subtler but indistinct face stripes, intermediate bill shape, color, and body pattern are useful. Also note intermediate wing pattern.

Most similar to American Wigeon x Mallard. Cheek patch usually more orangey on male EUWI x MALL as is body on females. Usually safe to assume wigeon parent based on range.

Media:

https://macaulaylibrary.org/asset/298649061

https://macaulaylibrary.org/asset/196715151

https://macaulaylibrary.org/asset/646752361

Males have variable head patterns, but usually have some degree of paleness on the cheek. Pale area often split in two by a dark "tear streak". Bill dull yellowish to pinkish to blue. Long tail as on AMWI, gray body, and paler breast than on MALL. Intermediate head shape and wing pattern; pale wash on coverts where white patch is on AMWI, white speculum border as on MALL. Females subtler but indistinct face stripes, intermediate bill shape, color, and body pattern are useful. Also note intermediate wing pattern.

Most similar to Eurasian Wigeon x Mallard. Cheek patch usually more orangey on male EUWI x MALL as is body on females. Usually safe to assume wigeon parent based on range.

Media:

https://macaulaylibrary.org/asset/136660671

https://macaulaylibrary.org/asset/136660661

https://macaulaylibrary.org/asset/247033401

https://macaulaylibrary.org/asset/301087781

https://macaulaylibrary.org/asset/414553091

https://hybridduck.blogspot.com

Dark body, limited white bordering the speculum, and limited green on the head.  Body is very ABDU-like with green on head from AMWI parent. Intermediate head shape and very streaky overall. Dark tail. Known from a few individuals.

Most similar to American Wigeon x Mallard. Note the darker body, and less green on the head of males. Less white bordering the speculum, and speculum iridescence may be darker purple. Note also the dark tail.

Media:

https://ebird.org/checklist/S53074421

(Syn. Anas glocitans)

Other names: Brewer's Duck Bimaculated Duck, Bimaculated Teal

A variable but well known hybrid, the Bimaculated Duck was originally mistaken for a unique species. Males usually with Mallard-like head pattern except for the pale cheek. Head shape suggestive of GADW. Bill often pale with black stripe running down the center, but the amount of black is variable. Body gray overall, wing pattern intermediate with pale borders to speculum as on MALL and white secondaries as on GADW. Sometimes with white hip patch. Bill shape intermediate. Female subtler but identifiable when seen well. Bill and head shape are helpful as well as face pattern; the lines through and above the eye are less distinct than on MALL. Wing pattern intermediate. Some with pale belly.

Superficially similar to Mallard x Green-winged Teal, but face and bill pattern often slightly different. Wing pattern different with dark bar visible on side. On hybrids involving American Green-winged Teal a hint of the white vertical flank bar is sometimes visible.

Media:

https://macaulaylibrary.org/asset/90668931

https://macaulaylibrary.org/asset/145299171

https://macaulaylibrary.org/asset/420211221

https://macaulaylibrary.org/asset/609228854 - GADW x domestic MALL

https://macaulaylibrary.org/asset/653905576 - displaying to GADW