Rüppell’s Griffon Vulture

RÜPPELL’S GRIFFON VULTURE · Gyps rueppellii

L: 85-100 cm. WS: 230-250 cm. Wing: ♂  ♀ 670-710 mm. Weight: ♂ ♀ 6.500-9.000 g. Longevity < 30 years old.

Coordinators: Alex Ollé & Joan Goy

collage-vulture-gyps-rupell-fulvus

Taxonomy: 

· rueppellii (Narrow strip of sub-Saharan Africa, Senegambia to Sudan and Tanzania).

· erlangeri (Etiopía and Somalia).

Status:

Basically resident, with important dispersal movements. In the early 1990s it began to be detected with some regularity in Morocco and the extreme south of the Iberian Peninsula. It is now a regular bird with dozens of annual observations, especially of immature individuals between August and November, although individuals of any age and time of year can be observed. There are also numerous observations throughout Spain, and exceptionally also in France. These birds come to Europe naturally, through their association with the Griffon Vulture that winters in the Sahel, mainly in Senegambia.

Moult:

Second plumage: january to december 2cy. Until September of the second calendar year moults the 4-5 innermost moulted primaries.

Third plumage: from february to September 3cy. By September of the third calendar year it has moulted p6-8, even reaching p9. Most secondaries are juveniles.

During 4cy it moults the last outermost juvenile primaries (p8-9) and p10, and by the end of the period it has moulted most secondaries.

Sexing:

Sexes cannot be identified in field.

Similar species:

Griffon Vulture, White-backed Vulture, Lappet-faced Vulture.

Bibliography:

FORSMAN, D. 2016. Flight identification of raptors of Europe, north Africa and the Middle East. Bloomsbury.

OLLÉ, A. & TRABALON, F. 2019. Aves rapaces de Europa. Omega. 

RODRÍGUEZ G. & ELORRIAGA, J. 2016. Identification of Rüppell’s Vulture and White-backed Vulture and vagrancy in the WP. Dutch Birding 38: 349-375.

Rüppell’s Griffon Vulture Collages
Bonellis-Eagle-identification-aquila-fasciata

Bonelli’s Eagle

BONELLI’S EAGLE · Aquila fasciata

L: 65-72 cm. E: 145-180 cm.  Wing:♂308-530 mm,♀480-580 mm. Weight:♂1400-2200 g.,♀2100-3025 g. Longevity: < 25 years old.

Coordinators: Alex Ollé & Joan Goy

Bonellis-Eagle-identification-aquila-fasciata

Taxonomy:

· fasciata: from southern Europe and North Africa, to northern Indochina and southern China, through the Middle East.

· renschi: Lesser Islands of the Indonesian region of Sonda. Some taxonomists consider renschi a separate species.

Status: juveniles and immature birds – up to their 3rd or 4th year – make dispersal flights that vary in length but can reach over 1.000 km from the place they hatched. These birds tend to settle temporarily in areas with high availability of food resources. Adult birds on the other hand, are usually sedentary, expanding their territory only during the non-breeding period.

Moult:

Second plumage: 2cy. From March – May to the end of October. The moult starts with the inner primaries. Usually, they manage to replace the 6-7 innermost primaries and a few secondaries. However, amongst the southernmost populations in the Near East for example, they are able to moult all juvenile primaries.

Third plumage: during late spring through the summer of the 3cy. The juvenile primaries and secundaries that remained unmoulted are finally replaced. Then, another moulting cycle begins starting, once more, with the innermost primaries.

Adult plumage: the moult amongst adult birds usually have two asynchronous fronts, producing an irregular pattern. The females start moulting during the breeding season and before the males.

Sexing: males and females can be separated by size and structure. Females are larger and heavier, with the head proportionally smaller in relation to the body. Additionally, in juvenile plumage the females show a regular dark band across the greater and primary coverts that the males do not have. In adult plumage, the males are overall paler than the females, with 1) larger extension of the pale colouration on the edges of the tail feathers and 2) undertail coverts, tarsal coverts and throat feathers also paler. Nonetheless, or as a result of the paler colouration, the males show more obvious brown or darker streaks or spots than the females. The females have an overall darker colouration.

Similar especies: Booted Eagle, Short-toed Snake Eagle