Crows and dots are essentially identical in shape. Dots are little gumdrops that look like regular sized (T-1 3/4) LEDs, if you stand them up on two toothpicks. Crows are identical in shape and size-- and look like infrared LEDs or phototransistors.
Part of the circuitry snacks project: Edible models of functioning electronic circuits. Designed for fun, for geeks, for kids, and for teaching and learning electronics.