Abstract: In a cuckoo clock including a timing mechanism and a whistle means for tolling a time, a bird-displaying mechanism comprises- a clock housing having an aperture in the front wall thereof; door means pivotally mounted on the front wall adjacent the aperture; a bird movable into and out of the aperture and having movable wings; plate means pivotally supporting the bird; guiding means having a guiding base slidably supporting the plate means; driving means for driving the guiding means; control means for controlling the driving means in time to a tolling signal from the timing mechanism; spreading means including a rotation lever pivotally mounted on the plate means for spreading the wings when the plate means travels along the guiding base by a predetermined distance in response to the tolling signal.