Film about the breeding habits of four marshland birds - the swan, the coot, the great crested grebe and the dabchick - showing the birds courting, nesting and guarding their young against natural predators.
Visual detail is remarkably clear although the commentary is uninformative - "in spring the birds are busier and more excited than usual, for this is their mating season". (NB Following synopsis describes birds separately, not simultaneously as in the film.) Swan: preening itself, pair taking off with sounds of wing-beats audible, on nest and settling on eggs, cygnets after hatching. Coot: preening itself, nest among reeds, chicks swimming. Great crested grebe: courting pair shaking heads at one another, building floating island nest in shelter of reeds, cock collecting reed and mud building material and hen arranging it, grebe on nest exchanging calls with mate, baby grebe clambering onto mother's back. Dabchick: settling onto eggs in floating island nest. A tawny owl pouncing on a nest, a polecat eating eggs and a water rat on the prowl are some of the dangers faced by these bird island nest builders among reeds, chicks swimming.