Ant has brought in his prize model of a stag beetle and the team find out about Britain's biggest insect - sadly under threat in today's world.Green Balloon Club members Robert, Alexia and Joshua report on what they are doing to help build homes for stag beetles. Jelly visits Bill Oddie and they go on a bug hunt to see what they can discover in his garden.Lily-Rose is particularly fond of bees as they help pollinate her flowers, so she and Cat make a bee model. And finally Club members Jasmine and Jimmy set a beetle spot for everyone to look out for where they live.