Last Friday I gave you this sound and skull combination to have a go at identifying:
As many of you worked out, the skull and call belong to quite different species that share a love of the seaside.
These large marine ducks are at home on the water, where they feed on molluscs and crustaceans. They are probably best known for their super-soft downy breast feathers, that the females use to line their nests and humans use to fill their pillows.
These birds are great divers, using their wings to ‘fly’ underwater. They feed on small fish and other slippery critters, caught using that characteristic bill.
Congratulations to everyone who managed to work out what the two species were – there’ll be a final mystery sound from the British Library Wildlife Sound Archive to identify next week, courtesy of curator Cheryl Tipp!