24 August 2014 Last updated at 12:28
Two rare birds from southern Europe that were spotted building a nest at a nature reserve in Lincolnshire might stay over winter, the RSPB has said.
The pair of glossy ibises, who arrived in June, created a nest platform at Frampton Marsh, near Boston, but did not raise young.
The species has never bred in the UK and it is thought they flew north due to drier conditions in the south.
RSPB officer Chris Andrews said the site's wetlands could suit the birds.
Glossy ibises are a heron-like bird, with a green sheen to their coat, and usually breed in the south of France, southern Spain and in south-east Europe.