Ondra is a Mutant

Now thats a neck of an attentive belayer.  

​He's so....... European.

I see three Adams in this picture. 

Adam's Adam's Apple's Adam's Apple?

He has an extra knee...in his neck.

He used to work in the Martian mines and has five kids to feed.

Colonel Mustard wrote: He used to work in the Martian mines and has five kids to feed.

He wishes he had 3 arms but he’s doin just fine with 2?

B P wrote:

He wishes he had 3 arms but he’s doin just fine with 2?

You say that like all humans aren't mutating constantly. Some mutations are more visible or most useful, as opposed to a few cells here or there cleaned out by the immune system before a Sentinel comes looking for you.