Bird feed is a quest item used only in Biohazard. It is found by searching the cupboard in Jerico's house, immediately south of the northern bank in East Ardougne.
It is thrown onto the watchtower fence to cause a distraction by releasing the pigeons from the pigeon cage, in order for the player to climb the rope ladder near Omart to access West Ardougne.
Duplicates can be drop tricked by searching the cupboard to acquire another. However, throwing one bird feed at the watchtower will delete additional copies, and the player will no longer be able to acquire any more bird feed.