Original guess about <aside> contents was right :(

Author: fazl

reintro/birds/index.html

@@ -32,21 +32,21 @@ <h2>Welcome</h2>
               tips, and photos with other like-minded people.</p>
             <p>So don't waste time! Get what you need, then turn off that computer and get out into the great outdoors!</p>
           </section>
+        </article>
+        <aside>
           <section>
             <h2>Favourite photos</h2>
             <a href="favorite-1.jpg"><img src="favorite-1_th.jpg" alt="Small black bird, black claws, long black slender beak, links to larger version of the image"></a>
             <a href="favorite-2.jpg"><img src="favorite-2_th.jpg" alt="Top half of a pretty bird with bright blue plumage on neck, light colored beak, blue headdress, links to larger version of the image"></a>
             <a href="favorite-3.jpg"><img src="favorite-3_th.jpg" alt="Top half of a large bird with white plumage, very long curved narrow light colored break, links to larger version of the image"></a>
             <a href="favorite-4.jpg"><img src="favorite-4_th.jpg" alt="Large bird, mostly white plumage with black plumage on back and rear, long straight white beak, links to larger version of the image"></a>
           </section>
-        </article>
-        <aside>
-          <p>This fake website example is CC0 — any part of this code may be reused in any way you wish.
-              Original example written by Chris Mills, 2016.</p>
         </aside>
       </main>
 
       <footer>
+          <p>This fake website example is CC0 — any part of this code may be reused in any way you wish.
+              Original example written by Chris Mills, 2016.</p>
       <p><a href="http://game-icons.net/lorc/originals/dove.html">Dove icon</a> by Lorc.</p>
       </footer>
   </body>