04/10/2026
6. Last meeting, Mr Bashful was asked the question, 'How did primates lose their tail while they were evolving into human beings? He began to answer arrogantly, and then was quickly put in his place. He didn't know the answer!
Well, that's not surprising. There is an awful lot he doesn't know (but he pretends he does).
Anyway, Mr B reckons he has found an answer to the question and has asked your helpful scribe to present a brief summary of his findings here, for the person who asked the question, George. Well, I will comply. Mr B has written:
The smaller varieties of primates needed their tails because, being light and nimble, they would run along branches on all fours, and their tails helped them keep their balance. Plus, the tail was used as another 'limb' to grab onto branches.
It was more dangerous for the heavier species to run along branches, so instead, they hung onto branches with their hands and swung from branch to branch. Its limbs were stronger and more reliable than a tail. As a result, over time, the creature evolved strong arms, strong grips, and flexible shoulders; and their tail became a liability because it added weight, it slowed them down, it could get injured, and it was a waste of calories.
Over time, those larger primates lost their tails. How? In the prestigious science magazine, 'Nature' (Vol 626, Issue 8001, 29 February, 2024) it is suggested that it was not a long, slow process of evolution; rather, a major genetic that mutation spread quickly. A large primate was born without a tail, and the benefits were significant. Not only did the missing tail rectify the problems mentioned above, it also created a more compact lower back and pelvis. And, without tails, they could climb tree trunks more easily, and reach food that their heavier, more unwieldy relatives could not.
The mutation spread quickly due to 'genetic drift'. (In small populations, a creature born with a clear advantage over others can find more mates, and over a relatively short period of time its genes can spread to the entire group. And with even more time, that small group of primates can come to dominate other populations in the area, and the gene will continue to spread. That's genetic drift.) So, when a large primate was born without a tail in a small population, the advantages were so significant that genetic drift occurred, and soon the mutation spread.
A new family of primates had been created: the apes. Apes and monkeys differ in a number of ways, but two key differences are: monkeys have tails and tend to be smaller than apes. (And yet, many people today still call chimpanzees 'monkeys'.)
Like many memes featuring the 'infinite monkey with a typewriter', the creator of this meme uses an ape, not a monkey!
This is a chimpanzee, not a monkey!