Black-necked Grebe
Podiceps nigricollis
The black-necked grebe usually measures between 28 and 34 centimetres (11 and 13 in) in length and has a wingspan range of 56–60 centimetres (22–24 in) in P. n. nigricollis, and 52–55 centimetres (20–22 in) in P. n. californicus. It weighs 215 to 450 grams (7.6 to 15.9 oz), with males being on average heavier than females. The nominate subspecies in breeding plumage has the head, neck, breast, and upper parts coloured black to blackish brown, with the exception of the ochre-coloured fan of feathers extending behind the eye over the eye-coverts and sides of the nape. Voice: When breeding, the black-necked grebe gives a quiet "ooeek" that ascends in pitch from an already high pitch. This call is also used as a territorial call, in addition to a low and fast trill, which itself is also used during courtship. Another call is a short "puuii" or "wit". This grebe is silent when it is not the breeding season and when it is feeding or resting.
ID text from Wikipedia, CC BY-SA 4.0
Red-necked Grebe
Podiceps grisegena
The red-necked grebe is a medium-large grebe, smaller than the great crested grebe of Eurasia, and the western and Clark's grebes of North America, but noticeably larger than other northern grebe species. In breeding plumage, it has a black cap that extends below the eye, very pale grey cheeks and throat, a rusty red neck, dark grey back and flanks, and white underparts. The eyes are dark brown and the long, pointed bill is black with a yellow base.
ID text from Wikipedia, CC BY-SA 4.0
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