Redwood bird houses are used in setting bird house traps on Fossil Island, requiring a Hunter level of 89 to use. They are made by using redwood logs on a piece of clockwork while having a hammer and chisel, requiring a Crafting level of 90, and granting the player 55 experience.
The bird house must be filled with hop seeds as bait, up to a maximum of 10, or 5 if using wildblood seeds. After doing so, the bird house will passively capture birds. It can trap up to ten birds, granting 1,200 experience if the birdhouse is full, which will take approximately 50 minutes.