Category Archives: Birdlife of Spain

Painting one turbine blade black reduces bird fatalities by 72%, says study

Sometimes the simplest solution is the most efficient!

Fascinating to hear that scientists in Norway have found that painting one of the three blades on a wind turbine black reduces avian deaths by 72%.

In the paper, the scientists explain why birds are susceptible to flying into rotating turbine blades and why a single black blade helps them to perceive the rotor as an obstacle.

“Relative to humans, birds have a narrow binocular [eg, using both eyes to focus on one object] frontal field of view and likely use their monocular [using each eye independently] and high‐resolution lateral fields of view [ie, having eyes on opposite sides of their heads] for detecting predators, conspecifics [ie, birds of the same species], and prey,” the authors write.

“Within an assumed open airspace, birds may therefore not always perceive obstructions ahead, thereby enhancing the risk of collision. To reduce collision susceptibility, provision of ‘passive’ visual cues may enhance the visibility of the rotor blades, enabling birds to take evasive action in due time.”

It is thought that birds see the rotating white blades as a “motion smear” — the blur effect humans see when waving a hand quickly in front of their eyes — and do not perceive this blur as a moving object.

Painting one blade black is believed to create motion smear patterns that the bird perceives as a moving object, “as the frontal vision in birds may be more tuned for the direction of movement”.

Read the full article at Recharge….


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Short-toed Eagles in the natural park of Grazalema

March brings a great joy for lovers of these spectacular birds when yet again they have made it across the Strait of Gibraltar to their breeding grounds in Europe. The first single birds start appearing at the end of February but the massive migration comes in March, when clouds of birds can be seen entering continental Europe.

This Eagle´s appearance and its habits make it a treat to watch, whether you are a seasoned birder, a casual nature lover or a walker who maybe has never seen an eagle before.  Once you have spotted this easy-to-identify, pale, graceful silhouette against the blue Andalucían sky, hovering like a kestrel while scanning the limestone rocks and scrub to find prey, you just may become a life-long fan. Continue reading Short-toed Eagles in the natural park of Grazalema

The Griffon Vultures of Grazalema (Gyps fulvus, Buitre Leonado)

Visible all year in the natural Park of Grazalema this bird is larger than an eagle, with a wingspan of up to 260 cm (8.53 Ft). In flight, their wings are broad, with the primaries (finger-like feathers) usually clearly visible; the tail is short, and the neck retracted. It has buff brown coloured plumage on the back, stomach and the anterior band of the wings, while the rest of the wing feathers and tail are dark brown. The head and long neck are covered with white down and there is a distinctive collar of long feathers. On adults the bill is yellow and collar white, whilst on juveniles the bill is grey and collar pale brown. They feed on carrion, most of the time in a state of decay and at other times in an initial stage (especialy large mammals). The carcasses left out by farmers are also an important part of the diet of these birds. Continue reading The Griffon Vultures of Grazalema (Gyps fulvus, Buitre Leonado)