Birds
Bearded Vulture
Gypaetus barbatus · also called lammergeier, bearded vulture, ossifrage
The bearded vulture, or lammergeier, is the bone specialist of the mountains — a huge, rust-and-slate raptor that lets other scavengers take the meat off a carcass and then flies away with the skeleton. Bones it cannot swallow, it drops from a great height onto rock until they shatter.
Overview
Bearded vultures live in high mountains across southern Europe, Africa, the Middle East, and Central Asia, from about 1,000 metres up to 7,500 metres on Everest. They range over enormous territories on narrow, pointed wings and a long wedge tail, gliding along ridges and cliffs. Unlike other vultures they are not bald — they have a full head of feathers and the small tuft of black bristles under the bill that gives them their name.
A diet of bone
The bearded vulture is the only vertebrate that lives almost entirely on bone — 70–90% of its diet. It swallows bones whole up to the size of a lamb’s leg, and its stomach acid (around pH 1) dissolves them over about a day, releasing the marrow fat inside.
Bone-dropping
For bones too big to swallow, the vulture carries them 50–150 metres up and drops them onto flat rock, returning to try again if they do not break. Favoured rock slabs, called ossuaries, are reused for generations. It also drops tortoises — by legend, one killed the Greek playwright Aeschylus in 456 BC. Young birds take up to seven years to master the technique.
The applied colour
A bearded vulture’s feathers are naturally white, but wild birds bathe in iron-rich mud and springs to stain themselves orange. The behaviour is deliberate and appears to signal status — dominant, older birds tend to be more richly coloured — and may have a mild antibacterial benefit.
Status
The bearded vulture is Near Threatened, with roughly 1,300–6,700 mature birds. Centuries of persecution (from the false “lamb-killer” myth), poisoning meant for other predators, and power-line and turbine collisions wiped it out of the Alps by 1900. A decades-long reintroduction programme has restored a breeding Alpine population, but the species is still declining across much of Africa and Asia.
Bearded Vulture: common questions
Does the bearded vulture really eat mostly bones?
Yes, and it is the only vertebrate known to live almost entirely on bone. Around 70 to 90 percent of its diet is bone and the marrow inside it. When it finds a carcass, it typically waits for other scavengers to strip the meat, then takes the skeleton. It swallows bones up to the size of a lamb's leg whole, and for anything too big to swallow it uses the bone-dropping technique. Its digestive system is built for this — extremely strong stomach acid dissolves the bone over about 24 hours, releasing the fat and nutrients locked inside.
How does the bone-dropping work?
The vulture picks up a large bone in its feet, flies up to somewhere between 50 and 150 metres above a chosen patch of sloping rock, and drops it, then spirals down to feed on the marrow and swallow the splinters. If the bone does not break, it retrieves it and tries again. Individual birds use the same rock slabs repeatedly — these sites are called ossuaries and can be littered with bone fragments. Juveniles take up to seven years to become proficient, learning the right height, angle, and target. The species' old English name "ossifrage" means "bone-breaker," and the German Lämmergeier means "lamb-vulture," from a false belief that it carried off live lambs.
Why is a bearded vulture orange when its feathers are white?
The orange is applied, not grown. The bearded vulture's body and head feathers are naturally white or cream, but wild birds actively bathe in pools, mud, and springs that are rich in iron oxide, staining themselves rust-red. The behaviour is deliberate and can take an hour, and birds will travel to specific coloured sites to do it. The leading explanation is that it signals status or individual quality — older, more dominant birds and those from mineral-rich territories tend to be more intensely coloured — and it may also have a mild antibacterial effect. In captivity, without the right mud, the birds stay white.
Is the bearded vulture dangerous to livestock or people?
No. Despite the "lammergeier" name and centuries of persecution based on the myth that it snatches lambs and even children, the bearded vulture takes almost no live prey beyond the occasional tortoise or small animal, and there is no evidence it has ever harmed a person or carried off a lamb. The myth, along with poisoning aimed at other predators and collisions with power lines and wind turbines, drove it to extinction across the Alps by the early 1900s. A long reintroduction programme has since returned breeding birds to the Alps, and it is slowly recovering there.