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Bill Oddie presents the chiffchaff.
Chris Packham presents the blackbird.
Wildlife sound recordist Chris Watson presents the firecrest.
Martin Hughes-Games presents the linnet.
David Attenborough presents the sounds and story of the blackcap.
David Attenborough presents the starling.
Geneticist Alison Wollard explains her enthusiasm for a tiny nematode worm.
Presented by Anna Hill. New avian flu rules have been brought in overnight.
Michaela Strachan presents the story and sound of the house sparrow.
Adam Rutherford asks if we are ready for artificial intelligences making decisions for us.