On the other hand, birds aren't mammals and can eat lots that we cant. This particular night shade is one of the least toxic and according to wiki "
The poison in this species is believed to be solanine.[17] The alkaloids, solanine (from unripe fruits), solasodine (from flowers) and beta-solamarine (from roots) have been found to inhibit the growth of E. coli and S. aureus.[18] Solanine and solasodine extracted from Solanum dulcamara showed antidermatophytic activity against Chrysosporium indicum, Trichophyton mentagrophytes and T. simil, thus it may cure ringworm.[19]
The stems are approved by the German Commission E for external use as supportive therapy in chronic eczema.[20]"