with Su Ingle and Michael Jordan Swallows, Swifts and House Martins Beautiful, fast-flying spring visitors, but it's so difficult to tell them apart. Or is it? Su and Mike come up with some sure-fire methods of telling at a glance.
Su climbs deep inside a cave after a furry, intelligent and social flying mammal - the bat, and finds one of Britain's rarest and biggest species, the greater horseshoe bat. Mike looks at one of our commonest mammals - the grey squirrel. Is it really a pest?
Also some of the children who've qualified for the Kestrel Award.
Producer MUtE BEYNON. BBC Bristol