POPA ....  DARVIN and Darvinisty ... ???
New amazing research show !!!
that ..... male monkey exchange most delicious banana , food , so on
and go without food for a week or two - for a photo of a female  bum 
... POPA ...
They look at the photo all the time , only have a little break for a
drink ..... and keep this
as  '' a most wonderful object in possession ''