I recently watched a really good documentary series called Inside Nature&#x27;s Giants[1], featuring dissections of various large animals. In the giant squid episode they have a bit about the donut-shaped brain. I found this version of it on youtube:<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=088bhv3pjq0#t=49m34s" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=088bhv3pjq0#t=49m34s</a><p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Inside_Nature&#x27;s_Giants" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Inside_Nature&#x27;s_Giants</a>