Crocodiles, BB King, horseshoe crabs, cockroaches and Angus Young.
What do they have in common?
All of them have been around for a very long time, and none of them has needed to change with the times.
Why? Because, in evolutionary terms, they hit the nail smartly on the head at a very early stage.
Theyâ€™ve always been so damn good at what they do â€“ whether thatâ€™s ambushing wildebeest in the Masai Mara or kicking out a blistering blues lick â€“ that theyâ€™ve stayed rock solid while other less well-adapted creatures have had to re-invent themselves to keep filling their bellies and attracting mates.
Angus Young was barely into his 20s on â€˜High Voltageâ€™, AC/DCâ€™s first album released outside Australia, but you can hear his trademark style very clearly on these early tracks.
And, goshdarnit, itâ€™s still going strong more than three decades later.
Like BB King, Angus could never be described as technically â€˜flashâ€™ on the frets. Famously, BB canâ€™t sing and play at the same time, and can be heard telling The Edge on U2â€™s â€˜Rattle and Humâ€™ movie that he â€˜donâ€™t do chordsâ€™.
But try to re-create his style and tone, and youâ€™re just about guaranteed to fall short â€“ for the same reason that you wonâ€™t be able to sing like Tom Waits or play drums like Ringo Starr.
These musicians are freaks, in the true sense of the word. They have a freakish propensity to create music that demands attention, like Lewis Hamilton is freakishly good at driving quickly or David Cameron is freakishly insufferable.
Their sound wallows around for a bit in their soul, then hangs a right through their heart before heading straight for their fingers or voicebox.
As bluesman Willie Dixon put it: â€œA bad rendition of you is better than a good rendition of somebody else.â€
These freaks are few and far between, and weâ€™re privileged just to be allowed to stand and gawp at them.