A white-naped crane (Grus or Antigone vipio) from the Tierpark Röhrensee, a mini-zoo situated in Bayreuth, Germany. The few cages and enclosures are distributed along the alleys of a small public park, on free display for its visitors.
I caught the birds in the middle of a preening session.
On the pictures found online, the area surrounding the birds’ eye is much more red than on these two. Could it be linked to their diet, which probably differs from the wild? Credit: Yalakom
A snow-white neck blurring the lines. Credit: Yalakom
A pretty serious bill. Credit: Yalakom
These birds are native of Eastern Asia (see range map including winter migrations below) where their conservation status Continue reading
Diclofenac is a non-steroidal anti-inflammatory drug that has been widely used worldwide to treat both humans and animals since first developed by Ciba-Geigy, now Novartis, in 1973. Trade names include Voltaren, Cataflam, Acoflam and many others. Concerns regarding the safety of such products for European vultures and other carrion-eaters like the golden eagle and the rare Spanish imperial eagle were raised earlier this year by a coalition of nature protection organizations led by the Vulture Conservation Foundation. The EU Commission subsequently initiated a referral procedure pursuant to article 35 of Directive 2001/82/EC on veterinary medicinal products to screen the drug for its possible impact on the scavengers.
The assessment, performed by the European Medicines Agency (EMA), concluded that the veterinary use of diclofenac in livestock animals poses a risk to European vultures and other necrophageous bird species. By acknowledging such a risk despite the lack of evidence “that a vulture in the European Union has been exposed or died as a result of feeding on carcasses from food-producing animals treated with diclofenac”, the EMA adopts a preventive approach and reasons by analogy with cases of intoxication seen in non-European countries to fill this “major data gap.”
A group of European vultures: Griffon Vulture (Gyps fulvus), Cinereous vulture (Aegypius monachus), Egyptian vulture (Neophron percnopterus). Author: Richard Lydekker (1849-1915). This image is in the public domain.
The direct connection between diclofenac ingestion and vulture mortality is indeed well established. Continue reading
Book cover for Audubon’s Birds of America
Update March 6, 2015
If you are in New York City, do not miss Audubon’s Aviary: The Final Flight, an exhibition of Audubon’s splendid water colors organized by the New York Historical Society from March 6, 2015 to May 10, 2015.
More information on the museum’s website and an interesting article from the New York Times.
In 1820, John James Audubon (1785-1851) challenged himself to sketch and describe all North American avifauna, thus fully embracing his genuine, lifelong passion for birds. The result of a decade spent exploring the wild west was an impressive collection of 435 life-size plates of the various bird species encountered by the self-taught, Franco-American artist and naturalist. His genius has been to give a dynamic representation of living creatures rather than depicting them in a more static, lifeless posture, which was common usage at the time. Audubon’s original concept was rejected by many, and it is in England, not the United-States, that he found positive reception for his unconventional drawings which were eventually published in a book called Birds of America.
Ruffed Grouse, hand-colored engraving by John James Audubon in circa 1827-1838
Peregrine Falcons, hand-colored engraving by John James Audubon in circa 1827-1838
Gyrfalcon , Falco rusticolus, hand-colored engraving by John James Audubon in circa 1827-1838
His artwork continues to be considered a masterpiece as proven by the considerable auction prices Continue reading
For thousands of years, Przewalski horses withstood a multitude of natural and anthropogenic hazards on the East Asian grasslands, but eventually died out under the combined pressure of environmental stressors of the 19th-20th centuries. Today, reintroduced Takhis are learning to cope with old and new hazards on their reintroduction sites. While some environmental stressors disappeared (military activities, hunting), others exacerbated (overgrazing, land degradation, desertification) and new ones emerged (e.g. road erosion, mining). Reintroduced individuals bear on their shoulders the long term survival of the species, but their relatively low numbers still make them particularly vulnerable to such threats.
Livestock overload and overgrazing
Flag of the Mongolian People’s Republic
Takhis died out under communism in the Mongolian People’s Republic in 1969 and were brought back to their native land at a time of transition to a free-market economy in the early 1990’s. Until the 20th century, the Mongolian steppe, which covers 80% of the country’s land area, had always been exploited by herdsmen through transhumant pastoralism, the most adequate way of using the land under the ruthless regional climate. Collectivization never suppressed this effective traditional system, but herders’ mobility on the steppes became tightly controlled from 1950. As ancient pastoral customs were replaced by statutory regulations and state support increased in the form of subsidies and supplies to compensate the loss of mobility (winter forage, consumer good, transport, risk management and marketing services, etc.), nomads progressively Continue reading
The idea of reintroducing Przewalski horses in the wild in East Asia, their last known historic range, materialized in the late 1970’s and the first release of horses took place in the early 1990’s. As of today, reintroduction was achieved in two out of three and one out of three Mongolian and Chinese proposed sites, respectively.
Inge and Jan Bouman, together with Mongolian scientist Tserendeleg Jachin, were the pioneers of Takhi reintroduction. They created the Foundation for the Preservation and Protection of the Przewalski Horse in Rotterdam in 1977 and launched the Khustain Nuruu Project. It took over a decade to enhance the genetics of Takhis, which had become largely inbred in captivity. In 1991, the Mongolian government established Hustai National Park for the purpose of Takhi reintroduction; it was then approved UNESCO Biosphere Reserve in 2002. Situated 100 km south-west of Ulaanbataar, the 50,000 ha area (excluding buffer zones and transition areas) was chosen for the quality and abundance of its wildlife. The horses enrolled in the project were bred in Holland and kept in semi-wild reserves where they could freely interact and form social bonds before being flown to Mongolia. Between 1992 and 2000, 84 Takhis aged 3-5 landed at Hustai and the first individuals were released into the wild in the summer of 1994.
Przewalski Horses in the wild at Hustai National Park / Credit: Kelsey Rideout
Nowadays, some 300 horses divided in 30 harems inhabit the park. The objective is to reach a population of 350, which would ensure the sustainability of the species and remains Continue reading
Reintroducing Takhis in East Asia is a long term process with a threefold objective: establish viable populations in parts of the horse’s historic range, restore degraded steppe ecosystems and foster socio-economic development, which in turn would guarantee the long term success of reintroduction.
When the first reintroduction program was launched in the late 1970’s, the Przewalski horses had been living in captivity for almost a century. To return to their native steppe, they first had to learn to be wild again. In addition to reducing genetic diversity, captivity had made the horses entirely dependent on men for their survival and inhibited their most basic instincts. In this context, reintroduction would be a marathon and a complex learning process for the horses.
“Twenty years ago a subspecies of wild horses, the Asian Przewalski horse, became extinct in the wild. There were still specimens in zoos but ten generations of inbreeding had weakened them and instead of infinite grasslands they knew only iron fences. The animals were merely a shadow of their former selves.” It is with these words that Prince Bernhard of The Netherlands described the poor and seemingly hopeless condition of the species in the aftermath of its extirpation in the wild. Following this event, Przewalski horses experienced a dramatic population bottleneck. As the species survived through just a few captive individuals, the loss of founder genes became a terrible threat to their viability. Should they be saved, prompt action was required: breeding a healthy population through inter-zoo exchanges was a matter of urgency. From 1979, various conservation programs Continue reading