Danish researcher shares two new important Shelley’s Crimsonwing photos with the RFCG!

4 Aug
 

Photo 1: Side view of a male Shelley’s Crimsonwing photographed in 1996 (courtesy Morten Dehn).

Photo 1: Side view of a male Shelley’s Crimsonwing photographed in 1996 (courtesy Morten Dehn).

Photo 2: Ventral view of the same bird (courtesy Morten Dehn)

Photo 2: Ventral view of the same bird (courtesy Morten Dehn)

Eureka! The Rare Finch Conservation group (RFCG) has received two new photos of a Shelley’s Crimsonwing!  The photographs taken in 1996 by Morten Dehn from Denmark represent a valuable addition to the sparse visual evidence of Africa’s rarest finch.

Shelley’s Crimsonwing (Cryptospiza shelleyi) is a colourful and elusive bird. Only a few people have ever seen a Shelley’s Crimsonwing in the montane forests of the Albertine Rift Valley, where it is endemic and categorized as Vulnerable by the IUCN Red List of Threatened Species, checked on July 2016.

Although scientifically described more than 100 years ago (Sharpe, 1902), what we know about this bird is minimal, to say the least. Almost nothing is known about its natural behaviour, diet and breeding ecology. While it probably never was a very common bird, there is some evidence that the population has dramatically decreased since the 1970s; possibly because of on-going habitat destruction, but the reasons are unclear and require further investigation.

In 2005, the RFCG adopted the Shelley’s Crimsonwing as the rarest African finch to champion conservation actions and raise awareness  for the Shelley’s Crimsonwing. At that time, not a single photo of a live Shelley’s Crimsonwing was known to the RFCG.

Shelley's crimsonwing. Photo courtesy www.gorilla.org

Shelley’s crimsonwing. Photo courtesy http://www.gorilla.org 2008

Simon Espley, one of the founding members, found the first known photograph of a Shelley’s Crimsonwing on the homepage of The Gorilla Foundation (www.gorilla.org). The Foundation reported that they had mist-netted and photographed a male bird in the Virunga National Park (DRC) in 2008. Subsequently during 2009 and 2010 the RFCG, with funding kindly received from the Hans Hoheisen Charitable Trust, started to do extensive fieldwork in search of Shelley’s Crimsonwing in the Bwindi Impenetrable Forest National Park (Uganda). Unfortunately, no Shelley’s were found.

However, the attention of the first known photo and the report the RFCG published and shared with various important conservation organisations helped to raise public awareness for this species, which had been flying under the radar of many ornithologists, birders and twitchers for a number of years.

As a result of this exposure, the RFCG was contacted in 2014 by Colin Jackson, from Kenya, who reported that he had mist-netted and photographed a male Shelley’s Crimsonwing in 1997 whilst on a museum field expedition primarily surveying gorillas in the Virunga National Park, DRC.Colin very kindly donated his photo of the Shelley’s to the RFCG

The world's second known photograph of a Shelley's crimsonwing cockbird. Photo Colin Jackson

Photo Colin Jackson taken in 1997

(http://africageographic.com/blog/the-only-two-known-photos-of-a-live-shelleys-crimsonwing/). Later, another photo of a Shelley’s Crimsonwing was uncovered by the RFCG at the renowned natural history museum, The Field Museum (Chicago, USA). Co-workers David Willard and Tom Gnoske of The Field Museum took the photo whilst on an expedition in the Rwenzori Mountains National Park in 1990 and 1991

The world's third known photograph of a Shelley's crimsonwing.Photo Chicago Field Museum. Co-workers David Willard and Tom Gnoske

Photo Chicago Field Museum. Co-workers David Willard and Tom Gnoske. 1990/1991

(https://rarefinch.com/2015/10/30/a-great-new-photo-of-a-shelleys-crimsonwing/).

The two latest photographs received , as seen above, were taken by Morten Dehn, together with his colleague Lars Christiansen, whilst doing their MSc work at the University of Copenhagen, Denmark performing a survey of the altitudinal distributions of montane forest birds in the Rwenzori Mountains National Park, Uganda. During surveys between July and the beginning of December 1996, Dehn and Christiansen mist-netted birds in the Mubuku/Mahoma/Bujuku River valleys at altitudes between 2100 and 3000 m. ( These overlapped  the regions surveyed by researchers of The Field Museum in 1990 and 1991.). A total of five male Shelley’s Crimsonwing were captured. One of them was photographed from two different angles ( photos 1 and 2 above). The two researchers stated that Shelley’s was by far the rarest of the four Crimsonwing species captured during their survey, which yielded only 5 out of the 76 Crimsonwing captured.( The four crimsonwing species are ; Red -Faced Crimsonwing cryptospiza reichenovii , Abyssinian Crimsonwing Cryptospiza salvadorii, Dusky Crimsonwing Cryptospiza jacksoni and the Shelley’s crimsonwing Cryptospiza shelleyi )

Like the other known photos, the bird was again hand-held when photographed. Photo 1 shows a side view, photo 2 a more unusual angle, allowing a ventral view that shows the under parts relatively well. This might be one perspective of the bird to be seen when encountered in the wild. Despite the colourful nature of the plumage, there is no doubt that the green, yellow ochre and black under parts provide good camouflage in the dense understory where the birds seem to linger most of the time. The red of the head and nape on this bird appears to be more even and continuous than what could be seen on the bird photographed by The Field Museum co-workers Willard and Gnoske in 1990 / 1991, suggesting that this may represent an older male. In particular on photo 2, the red of the head/nape really stands out and contrasts well with the greenish colour of the background. Therefore, if we were lucky enough to see a male  it would probably be the red colour that would catch our attention.

Although 20 years old, the photos kindly donated by Morten Dehn are a great find and confirm that awareness for this little-known species has grown and is reaching previously unknown people who have worked on Shelley’s Crimsonwing. They are able to add valuable data to our sparse knowledge.

Interestingly, all the known photographs were taken in the 1990’s, with the exception of the male Shelley’s Crimsonwing photo taken in 2008

During 1990, a total of 25 birds were mist-netted,  a number based on extensive research and publication consultation. Despite continuous efforts, the last 20 years have yielded only one male bird. Many experienced bird guides the RFCG talked to, who for many years have entered Shelley’s habitat every day, have never seen the species or say it’s extremely rare to see.

The estimated population size as stated in the IUCN Red List fact sheet for Shelley’s Crimsonwing is still 2,500 to 10,000. Conservatively, one may assume a population decline since the 1990s, based on the RFCG’s findings and conclusion after years of research and awareness campaigns.We urgently need more insights into the actual population size and distribution of Shelley’s Crimsonwing, its diet and its natural behavior to inform further conservation recommendations before this elusive and almost unknown species vanishes in silence.

Now that awareness is increasing, more people may try to take photos of a female bird, immature birds or perhaps even a nest. I cannot wait to see this.

For the RFCG: Prof. Sven Cichon, PhD (Basel, Switzerland)

Morten Dehn of Denmark, who together with Lars Christiansen did field work to survey the altitudinal distributions of montane forest birds in the Rwenzori Mountains National Park, Uganda, back in 1996 (courtesy Morten Dehn).

Morten Dehn of Denmark, who together with Lars Christiansen did field work to survey the altitudinal distributions of montane forest birds in the Rwenzori Mountains National Park, Uganda, back in 1996 (courtesy Morten Dehn).

Founded in 2005 The Rare Finch Conservation Group is registered in South Africa as a non-profit organisation and is totally dependent on donors and sponsors to carry out its conservation work on finches. All donations will be publicly acknowledged , unless otherwise requested, on the RFCG website. Donations can be made to the following account. Rare Finch Conservation Group, Nedbank. Account number 1933 198885 Branch : Sandown 193 305 South Africa ( For international donors please add ) SWIFT NEDSZAJJ.
For more info visit http://www.rarefinch.org or write to the secretary at editor@avitalk.co.za

 

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