Variable Hawk
Geranoaetus polyosoma
The name variable hawk is fully deserved, as both sexes occur in several morphs. Adults of all have a white tail with a contrasting black subterminal band and grey wings barred dark (in flight from below, the remiges appear whitish with fine barring and a broad black tip). The remaining plumage varies from very dark grey to whitish, and some individuals have reddish-brown to the underparts. Females usually have a reddish-brown back, which males usually lack, although at least some males also have this.
ID text from Wikipedia, CC BY-SA 4.0
White-tailed Hawk
Geranoaetus albicaudatus
The white-tailed hawk is a large, stocky hawk. It is similar in size to Swainson's (Buteo swainsoni) and red-tailed hawks (Buteo jamaicensis), with mean measurements slightly larger than the former and slightly smaller than the latter. It can attain a total length of 44–60 cm (17–24 in) and a wingspan of 118–143 cm (46–56 in). Body mass has been reported as 880–1,240 g (1.94–2.73 lb) (B. a. hysopodius) and 865–1,010 g (1.907–2.227 lb) (B. a. colonus). Standard measurements include a wing chord of 39–46.2 cm (15.4–18.2 in), a tail of 19.4–22 cm (7.6–8.7 in), and a tarsus of 8–9.2 cm (3.1–3. Voice: Its call is a high-pitched cackling ke ke ke..., with a tinkling quality that reminds some of the bleating of a goat or the call of the laughing gull.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Variable Hawk and White-tailed Hawk.