A 500-year-old clam has been invited to give the 2014 Reith Lectures.
It is believed it will be the first time a mollusc has been invited to give the lectures since they were inaugurated in 1948.
'Fossils have been associated with past Reith Lectures,' said a spokesman, 'but this is a mollusc first.'
A BBC spokesman said the clam would take as its central theme climate change and global warning 'of which it is uniquely placed to speak in depth and about which it has this week been consulted by a team of marine researchers at Bangor University'.
Sir David Attenborough, who met the clam a few years ago while making a BBC natural history programme, says he is confident it will be a groundbreaking lecture, attracting a worldwide audience.
'It will be a humbling experience,' he said.
Historians are hopeful that the clam might be persuaded to find time to throw some light on the Tudor period of English history.