Tim Birkhead looks at the guillemots of Skomer Island that have been studied for 42 years.
The green hairstreak butterfly is making a comeback in the Pentland Hills.
Tom Heap meets the critically endangered rock iguana of the Caribbean.
Tom Heap joins a night safari in search of the Caicos pygmy boa constrictor.
Trai Anfield is in Dorset to find a bee that builds its nest in empty snail shells.
Chris Sperring visits a hazel coppice awash with springtime flowers.
Trai Anfield encounters adders basking on the edges of Loch Lomond.
Chris Sperring searches for one of the most abundant mammals in the UK, the vole.
Trai Anfield searches for crossbills near Sherwood Forest in Nottinghamshire.
Trai Anfield witnesses the dawn eruption of starlings from the Somerset Levels.