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128 Bonelli’s Eagle
Javier Blasco-Zumeta & Gerd-Michael Heinze Ibercaja Aula en Red
http://aulaenred.ibercaja.es
BONELLIS EAGLE (Hieraaetus
fasciatus)
IDENTIFICATION
66-74 cm. Adult with dark upperpart; white
underparts with dark streaks; tail pale grey, with
broad dark subterminal band; wings with darker
upperwing and paler underwing; yellow legs.
Juvenile with pale brown colours.
AGEING
3 types of age can be recognized:
Juvenil with dark brown upperparts, sometimes
with some white speckling; pale brown head;
chestnut underpartsparts; all tail and wing
feathers with only one generation; underwing
with chestnut coverts and regular barring on
flight feathers; tail feathers pale brown, wuth 8-
9 dark bars without broad dark subterminal
band.
2nd year autumn/3rd year spring with
upperpart quite similar to adult; underparts
white-yellowish; flight feathers, and usually tail,
with moult limit between retained juvenile
feathers and moulted with adult pattern.
Adult with grey-brown upperparts, sometimes
white spotted; crown and ear coverts darker
than the rest of the head; white underparts with
dark streaked; dark grey underwing; if there is
moult limit, then all feathers have adult pattern;
grey tail feathers, with fine bars and broad dark
subterminal band.
CAUTION: during some years (subadult
birds) have their underparts tinged buff, but it is
not possible to give an exact age using this
character due to the variation in the period
needed to adquire the typical adult plumage.
Bonelli’s Eagle. Adult (14-III).
SIMILAR SPECIES
In hand, this species is unmistakable due to its
long tail, strong claws, feathered tarsi and
plumage pattern.
Bonellis Eagle.
Adult: pattern of
head, breast and tail.
Bonellis Eagle.
Juvenile: pattern of
head, breast and tail.
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