I've come across this collection of funny images in medieval art (e.g., cows in a boat on land) a few times - what's the reason for this type of art?

by 82364

http://em-ily-grace.tumblr.com/post/115305458387/two-medieval-monks-invent-bestiaries

frogbrooks

I can't answer this, but I remember that there was a similar question about Why are there so many medieval paintings of people battling large snails? that you could look into while you're waiting for another answer.