Several hybrid birds have been detected at the Water Ranch and some of the those are listed below (click for links to AZFO documentation).
In addition, eBird has generated a list of Recognizable Forms for North America. These are subspecies or subspecies groups that can be reliably distinguished in the field. These forms have been adopted for the official Arizona State Bird List. Some of these that have been detected at the Water Ranch are listed below.
Hybrids:
Reconizable Forms:
- both Great Basin (moffitti) and Lesser (parvipes) forms of Canada Goose
- both nominate (platyrhynchos) and Mexican (diazi) Mallards
- both American (carolinensis) and Eurasian (crecca) forms of Green-winged Teal
- both Western (calurus) and Harlan's (harlani) forms of Red-tailed Hawk
- Prairie (richardsoni) form of Merlin
- Red-shafted (cafer) form of Northern Flicker
- both Northern (pyrrhonota group) and
Southwestern (swainsoni) forms of Cliff Swallow
- Northern (aedon group) form of House Wren
- Eastern (celata), Rocky Mountain (orestera) and Pacific (lutescens) forms of Orange-crowned Warbler
- Northern (aestiva group) form of Yellow Warbler
- both Audubon's (auduboni) and
Myrtle (coronata) forms of Yellow-rumped Warbler
- both Mountain West (pileolata) and
Pacific Coast (chryseola) forms of Wilson's Warbler
- Western (nevadensis group) form of Savannah Sparrow
- Slate-colored (schistacea group) form of Fox Sparrow
- both Gambel's (gambelii) and
Mountain (oriantha) forms of White-crowned Sparrow
- Oregon (oregonus) form of Dark-eyed Junco
- Western (nelsoni group) form of Hooded Oriole
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