Aperture is like the cameras eye, when you change the aperture the light coming into the picture changes as if the eye is dilating. The aperture size of the butterfly is large because the background begins to blur out and has a small f-stop number probably something like F2 or F3. The photo of the landscape has a smaller aperture because you can see the entire area. Its f-stop may be a F20 or F22 considering how everything is seen clearly in the picture. For those who may be a bit confused, the f-stop is the focal length divided by th diameter of the pupil.
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