Bird houses are used in setting bird house traps on Fossil Island, requiring a Hunter level of 5 to use.
The bird house must be filled with hop seeds or herb seeds as bait, up to a maximum of 10, or 5 if using wildblood seeds and higher tier herb seeds such as ranarr and avantoe. After doing so, the bird house will passively capture birds. It can trap up to ten birds, granting 280 experience if the birdhouse is full, which will take approximately 50 minutes.
The following tool(s) are required to be in the player's inventory when creating this: hammer and chisel