As the vulture glides
|Griffon Vulture (Raymond de Smet)|
Griffon Vultures are resident here, but that bare statement obscures the fluid nature of the population in Extremadura, much as we cannot see either the atmospheric infrastructure that provides the means for these movements. Sightings of wing-tagged birds indicate that amongst the Griffon Vultures there are birds from colonies from right across the Iberian peninsular. Griffon Vultures take five years to reach adulthood and between two and four years of age they show considerable disperal behaviour, with movements especially noted in winter and spring (there is a tendency for northern birds to head southwards in the autumn). These journeys will have been taken with minimal exertion, deploying the thermal and glide technique to save energy, allowing some of these vultures, along with other gliding species, to make the crossing thus over the Straits of Gibraltar as well.
|Griffon Vulture fledgling (Martin Kelsey)|