I read that some duck species that normally feed on plant material will
switch to an  animal food diet  if they must.

>
> in page 83 he is on the reporting Cows fishing fish in tide pools  on the
>island of Garvellachs not far from Glasgow
>
>A kind of indication that the distinction between herbivorous and
>carnivorous is not written on stone.
>Carnivorous animals eat vegetations too.
>