The bearded vulture, or lammergeier, is normally found in Alpine regions, and has a wing span of 2.5m (8.2ft).
The rare raptor was captured on film by Mark Hawkes at Moulton West Fen earlier after news of its arrival circulated on social media.
Mr Hawkes, who lives in St Neots, Cambridgeshire, was lucky enough to see the vulture flying around with crows, and later "sitting tight in a field".
The bird was about two years old and had flown over to the UK from the Alps, where the endangered species is being reintroduced.
Previously, the only other reported sighting of a bearded vulture in the UK was in 2016, around Dartmoor and Monmouthshire.
But despite its enormous size, the bird is not dangerous to people or farm animals, and feeds on scavenged bones.