In this episode, our three friends are surprised to find that a bunch of bank swallows have decided to occupy their garden! Paola, Akio and Billie quickly learn that these little birds aren't interested in eating their vegetables (fortunately), but Greta also informs them that these swallows are an endangered migratory species!

The three must research and come up with strategies for living side by side with their feathered neighbours: protecting their habitat, preserving their food sources, and reducing light pollution. Meanwhile, Slinky is still on the prowl, with his own interpretation of what’s going on on the island...