“Where do hippos go to college?”/“To the hippocampus.”

The hippocampus (a major component of the brain of humans and other vertebrates) doesn’t contain a hippopotamus, but there are jokes. “And where do hippos go for advanced education?  Where do hippos go to improve their minds?  Where?  Where?  Where???...To a Hippocampus, of course” was posted on the newsgroup alt.humor.puns on February 23, 1996. “Where do hippos go to college? The hippocampus! HA!” was posted on Twitter by Molly Marie Griffin on October 28, 2010.
 
The joke has been printed on several images.
 
     
Wikipedia: Hippocampus
The hippocampus (from the Greek ἱππόκαμπος, “seahorse”) is a major component of the brain of humans and other vertebrates. Humans and other mammals have two hippocampi, one in each side of the brain. The hippocampus is part of the limbic system, and plays important roles in the consolidation of information from short-term memory to long-term memory, and in spatial memory that enables navigation. The hippocampus is located under the cerebral cortex in the allocortex, and in primates it is in the medial temporal lobe. It contains two main interlocking parts: the hippocampus proper (also called Ammon’s horn) and the dentate gyrus.
     
Google Groups: alt.humor.puns
Hippo jokes
John Walker (CS)
2/23/96
(...)
And where do hippos go for advanced education?  Where do hippos go to improve their minds?  Where?  Where?  Where???
 
...To a Hippocampus, of course.
       
Twitter
Molly Marie Griffin
@watchmecomplain
Where do hippos go to college? The hippocampus! HA!
@ConanOBrien has nothing on me. Except a TV show. And a beard. And an ape?
3:31 PM · Oct 28, 2010 · Twitter Web Client
   
Twitter
Diane McCarthy
@bintie
Where do hippos go to school? At the hippocampus! Hahahaha!!!
1:45 PM · Sep 9, 2011 · TweetDeck
 
Reddit—Jokes
Posted by u/Debataphile June 12, 2013
Where do hippos go to school?
The Hippocampus!
     
Facebook
Department of Anatomy & Cell Biology, McGill University
December 19, 2014 ·
Where does a hippo go to university?
The hippocampus!
Best joke from the departmental holiday party. I hope you enjoy it as much as I did!
 
Reddit—Dadjokes
Posted by u/tudorb October 26, 2015
You’ll never forget where hippos go to school.
The hippo campus!
   
Google Books
Dad Jokes:
The Punniest Joke Book Ever
By Editors of Portable Press
New York, NY: Simon & Schuster
2017
Pg. ?:
Q: Where do hippos go to college?
A: Hippocampus.
 
Reddit—Jokes
Posted by u/greencanon October 2, 2018
Where do hippos go to learn?
The hippocampus.
 
Reddit—Jokes
Posted by u/gregory_the_smarmy July 19, 2019
Where do hippos go to school?
The hippocampus.