Bird feed is a quest item used in Biohazard. It can be found by searching in a cupboard in Jerico's house, immediately south of the northern bank in East Ardougne.
During the quest, the player stands in the corner where the two spiked fences meet and inspects the watchtower fence. Then the bird feed is used on the watchtower fence to be thrown all over the tower, then the player releases the pigeons from the pigeon cage. This will cause them to immediately fly into the tower to eat causing the distraction needed for Omart to help the player over the gate separating East Ardougne from West Ardougne.