Evolution question.

[Arch]

.. If I were a lion i'd back off if you dropped your bowels

I doubt that. Lions are not fussy enough to let go of a decent meal just because it gets a bit shitty.

 

[mr Mag00]

That said, mice and such do apparently dribble urine all the time, and they do have bladders. And as some birds of prey can see the urine, by virtue of being able to see.. UV, I think it is, it can lead a predator right to them.

correct arch, the UV light reflected from urine allows kestrels to narrow their search from high up 100+ feet, they look for bright UV patches then look for movement which is when they then drop lower, 10-20 feet looking for further movemnet and then home in and wallop. The vole and mice use the urine for scent marking on trails so they can return home.

 

[ColinJ]

My curiosity started when I was about 10 and my neighbour's tortoise pissed on me.

Are you really slow, or was it a super-fast tortoise?

 

[tyred]

Personally, I prefer to have a bladder. I'd ruin my lovely Brooks saddle if I constantly dribbled on it...