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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 124. No. 4. December 2012 
TABLE 3. Intermediate Aechmophorus grebes (n = 93) and patterns of deviation. Utah. USA. 
Facial pattern 
Before eye _ Above eye Behind eye _Below eye Eye interseclion Bill color 
Debatable intermediates or Western Grebes (± WG) (// = 46) 
black black black 
black black black 
off-white black black 
off-white black black 
off-white black black 
off-white black black 
off-white black black 
off-white black black 
black black black 
black black black 
black black black 
black black black 
off-white black 
black black 
Grebes with clearly intermediate 
black black 
off-white black 
off-white black 
off-white black 
off-white black 
off-white black 
off-while black 
off-white black 
off-white black 
black black 
white black 
black black 
off-white black 
off-white black 
white black 
black black 
white black 
black black 
black far down, washed below 
black, washed white backward 
black 
black 
light gray 
diffuse gray 
light gray, thin line 
diffuse gray 
black 
white, thin gray line 
white, thin gray line 
light gray 
light gray 
light gray 
(IG) (n = 43) 
white 
white 
w'hite 
white 
black, off-white in lower part 
white, thin gray line 
white 
white 
white, thin gray line 
white 
white 
white 
white 
white 
off-white 
black 
white 
white 
below eye 
green 
5 
below eye 
green 
3 
below eye 
green 
1 
below eye 
yellow 
1 
below eye 
green 
7 
below eye 
green 
2 
just below eye 
green 
1 
lower eye 
green 
3 
below eye 
yellow 
1 
just below eye 
green 
12 
just below eye 
yellow 
2 
below eye 
green 
5 
below eye 
green 
2 
below eye 
green 
1 
lower eye 
green 
3 
lower eye 
green 
1 
center eye 
green 
6 
lower eye 
green 
5 
just below eye 
green 
2 
just below eye 
green 
8 
lower eye 
yellow 
2 
center eye 
green 
1 
just below eye 
yellow 
2 
center eye 
green 
2 
center eye 
yellow 
1 
center eye 
yellow 
2 
center eye 
yellow 
2 
center eye 
yellow 
2 
center eye 
orange 
1 
below eye 
orange 
1 
upper eye 
green 
1 
upper eye 
yellow 
1 
debatable intermediates 
white black white white 
white white washed gray white 
white light gray white white 
upper eye 
above eye 
above eye 
orange 
orange 
orange 
light gray 
light gray 
characters 
black 
light gray 
black 
black 
black 
black 
black 
light gray 
black 
black 
white 
black 
black 
light gray 
black 
black 
white 
white 
composed of an intermediate male and a West 
Grebe female were recorded at the breed 
colony in Farmington Bay, Crystal Unit 
complete assessment of pair composition v 
not attempted. Three other Clark’s Grebe p; 
were nesting in a channel in the reeds at Tun 
Unit and, at Strawberry Lake, two Western Grc 
pairs with a nest were found. Most gret 
encountered at Minersville Reservoir weredd 
in groups or dispersed: at the east end, three si 
rather baste platforms existed, all maintained 
Western Grebe pairs. 
Pairs with chicks were present at Panguitch 
Lake six Western Grebe families, an intermedi¬ 
ate female with two chicks was together with a 
Western Grebe male: Bottle Hollow Reservoir— 
four Western Grebe families, a debatable Western 
Grebe female with one chick was paired to a 
Western Grebe male and a debatable Western 
Grebe male was with a Western Grebe female and 
(wo chicks; Ouray National Wildlife Refuge—two 
Western Grebe families, a debatable Western 
Grebe male had two chicks with a W'estem Grebe 
female; and Strawberry Lake—nine Western 
