From the viewpoint of a plant that produces berries the birds that eat its berries can be grouped into two – the ‘good’ ones and the ‘bad’ ones.  The basis for this grouping lies in the reasons why plants commit all the effort into producing berries – to get their seeds dispersed to new growing sites.  This is supposed to work through a bird eating the berries, digesting the ‘pulp’ part, and then either regurgitating or defecating the seed(s) back out.  Birds that do this are called ‘Seed dispersers’ and are therefore ‘good’.  The various thrushes are in this group. Continue reading →