Birds eat the berries and then the seed either passes, unaffected, through the birds system, or the birds will rub off the offending sticky substance from their beak onto the branch they are perched on.
(Birds; eat; the berries) (the seed; passes; T:then) (the birds; will rub off; the offending sticky substance; from their beak; onto the branch) (they; are perched; on)
Birds the seed the birds they
eat passes will rub off are perched
the berries
T:then
the offending sticky substance from their beak onto the branch
on