Home » Birds in Morocco » Lanner Falcon usurping Buzzard’s nest after attacks (video)

Lanner Falcon usurping Buzzard’s nest after attacks (video)

After repeated attacks, the Lanner Falcons had successfully driven off the North African Buzzards from their occupied nest. The usurpers went on to occupy the nest and lay their own eggs.

North African Buzzard (= Atlas Long-legged Buzzard) and Lanner Falcon are widely distributed throughout Morocco [read: North African Buzzard is not a Long-legged but a Common Buzzard]. Both species nest on cliffs as well as on trees. In the desert areas where available nesting sites are lacking, the North African Buzzard nests also on electric pylons.

Both species are known to re-use other species’ nests (mainly those of Common and Brown-necked Ravens), although the Buzzards also build their own nests.

Fierce competition for nesting sites

In desert areas, where there is generally plenty of prey but nesting sites are limited, life can be tough as we will see below.

On 20 December 2018, a pair of North African Buzzard occupied an old nest located about ten kilometers northeast of Boukra in Western Sahara. The nest, which is very accessible, was on an Acacia tree of moderate height. On 26 January 2019, the reconstruction of the nest was almost complete.

On 10 February 2019, two eggs were already laid on the nest. Four days later, on 14 February, when the North African Buzzard was incubating the eggs, a Lanner Falcon was observed harrying the nest occupant (the first part of the video and photo below).

Lanner Falcon attacking the North African Buzzard which turns upside down as a defensive behavior, Boukra, Western Sahara, Morocco, 14 Feb. 2019
Lanner Falcon attacking the North African Buzzard which turns upside down as a defensive behaviour, Boukra, Western Sahara, Morocco, 14 Feb. 2019 (Anafis Association).

By 27 February, when members of Anafis Association (Kharraj et al. 2019) re-visited the site, the battle was already over by some time. In fact, at this date, the aggressive Lanner Falcons had already occupied the nest and were incubating their four eggs (see photo below and watch the second part of the video starting at 17th second, we can see four Lanner’s eggs and one of the Buzzard’s eggs).

Lanner Falcon’s interaction with large raptors

A wide range of interactions between Lanner Falcons and large raptors (including falcons of similar size) have been described in the literature. These include competition for nesting sites, aggressive behaviour, piracy and predation. Giovanni Leonardi’s monograph “The Lanner falcon” published in 2015 compiled several examples of these interactions from throughout the species range. After checking all the cited interactions, we couldn’t find any case of Lanner Falcon evicting a large raptor actively occupying its nest and incubating the eggs. The closest case we found is its interaction with the Bateleur (Terathopius ecaudatus) in Zimbabwe (Steyn 1980 cited in Leonardi 2015). However, this interaction is more or less “peaceful” as it involved the occupation of the Bateleur’s nest after its breeding has finished (the egg has disappeared in one case, and the Bateleur chick has successfully fledged in another).

Despite its boldness and aggressiveness, the Lanner Falcon is not always the winner in these interspecific interactions. As an example, the decline of the Lanner in mainland Italy has long been attributed in part to its displacement by the dominant Peregrine Falcon. The latter species is usurping the Lanner’s nesting sites and forcing it to occupy less optimal ones (De Rosa et al. 2019, Leonardi 2015).

You can lose or win a single battle, but the most important is to win the war. It seems that the Lanner Falcon, at least in the Mediterranean region, is losing the war especially against illegal trade (for falconry) and habitat loss (Corso 2018). [read: Huge number of wild-caught Lanner Falcons held in captivity (video)].

References

Corso, A. 2018. Updated status of European Lanner Falcon, Falco biarmicus feldeggii (Schlegel, 1843) (Aves Falconiformes): a taxon on the verge of extinction, with brief comments on the North African Lanner, F. biarmicus erlangeri (Kleinschimdt, 1901). Biodiversity Journal 9: 23-44

De Rosa, D., Di Febbraro, M., De Lisio, L., De Sanctis, A. & Loy, A. 2019. The decline of the lanner falcon in Mediterranean landscapes: Competition displacement or habitat loss? Animal Conservation 22: 24–34. doi:10.1111/acv.12430

Kharraj, S., Hane, M.S., Kara, M., Laaroussi, M.A.S. & Qninba, A. 2019. Installation d’un Faucon lanier sur une aire de Buse féroce occupée (Bou Kra, région de Laâyoune-Saquiat Al Hamra – Sahara Atlantique Marocain). Go-South Bulletin 16: 46-49.

Leonardi, G. 2015. The Lanner falcon. Giovanni Leonardi, Catania.

Lanner Falcon brooding its four eggs after it had successfully driven off the original occupants of the nest, Boukra, Western Sahara, Morocco, 27 February 2019
Lanner Falcon brooding four eggs after it had successfully driven off the original occupants of the nest, Boukra, Western Sahara, Morocco, 27 February 2019 (Anafis Association).

3 thoughts on “Lanner Falcon usurping Buzzard’s nest after attacks (video)”

  1. Lanner falcon is facing a fast decline and highly negative trend all over, including North Africa and the Middle East, not only in Europe (feldeggii).

    See my paper

    https://www.researchgate.net/publication/324823221_Updated_status_of_European_Lanner_Falcon_Falco_biarmicus_feldeggii_Schlegel_1843_Aves_Falconiformes_a_taxon_on_the_verge_of_extinction_with_brief_comments_on_the_North_African_Lanner_F_biarmicus_erlan

    The causes are multiple, both anthropogetic than natural and biological. It is a combination, in which the human-driven ones, among those falconery is one of the heaviest and worst causes, are contributing to the biological/natural causes. All factors conbined are killing completely this wonderful and unique falcon !!

    1. Thanks Andrea for your comments as usual.

      And yes, by the “Mediterranean region“ I mean both sides of the sea not just Europe.

      I knew about your paper as you asked me about the species status in Morocco before its publication. My bad, just forgot to mention it here. Now, I added it to the main text a week ago.

  2. Of course, WE ARE ALTOGETHER Mediterranean countries! Sorry if I did not understand. And yeees, you helped me a lot with Morocco info.

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