These are old TV episodes that were broadcast for the first time in the early 90's. I believe they are no longer being broadcasted in most countries. As far as I know, this cartoon (Super Mario World) is the only cartoon in existence in which Yoshi appears.

NOTE: If you experience problems downloading these episodes, try using your browser's "save as" function, accessible by right-clicking the episode's link (in Windows) or by holding down the control key as you click on the episode's name (in Mac). (i.e. "Save Target As..." in Internet Explorer, or "Save Link As..." in Mozilla Firefox).