This episode of Saving Species focuses on the issues facing migrant birds as they move around our shores.
Joanna Pinnock travels to a swallow roost in southern England, where overnight she joins the British Trust for Ornithology to trap and ring swallows as they gather in a mass roost to head south.
So how have the swallows and other summer migrants done this year?
To find our Paul Stancliffe of the BTO explains what is happening at the roost sight and how their research influences our understanding of the birds' needs.
However as swallows fly south, other migrants arrive into our country from the north.
Winter thrushes, redwing and fieldfare are a familiar sight in the winter countryside arriving now from Scandinavia.
But are we doing enough for them, are our hedgerows able to provide enough food?
And Howard Stableford joins Yadira Galindo from the San Diego Zoo in America. They investigate the issues of wind farms and the use of new technology to assist migrating Californian Condors with avoiding collision with the blades.
Listen to Saving Species
You can listen to this episode of Saving Species on BBC Radio 4 at 11:00am on Tuesday 9 October 2012. More information and a link to listen again can be found on the Radio 4 website.