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The problem is not markdown here. You got wrong link. When you visit the link https://en.wikipedia.org/wiki/Tetramorium#/media/File:Pavement_ants_battling_on_sidewalk.jpg (which you gave). Then, it...
Answer
#1: Initial revision
The problem is not markdown here. You got wrong link. When you visit the link https://en.wikipedia.org/wiki/Tetramorium#/media/File:Pavement_ants_battling_on_sidewalk.jpg (which you gave). Then, it will show `Tetramorium` wiki page. Not picture. I found another picture link for right side picture (https://en.wikipedia.org/wiki/Tetramorium#/media/File:Tetramorium_immigrans_casent0005827_profile_1.jpg). You might say that the link also isn't showing picture while using Markdown. If you visit that link than, you will see that there's lot of text. If a HTML page's body has lot of tags (HTML tags) than, picture won't show using markdown. Look at [the link](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Tetramorium_immigrans_casent0005827_profile_1.jpg/1024px-Tetramorium_immigrans_casent0005827_profile_1.jpg), the page only has `img` tag. So, it will work for markdown. To get this type of link you have right click on picture then, Copy Image Address. Markdown will work for that link. Sample : 