Birdhouses are a way to train hunter which is similar to farming; this is done on Fossil Island (Bone Voyage must be completed). Birdhouses are created by using logs on clockwork. After setting up the birdhouse, place 10 seeds inside. Olivia in Draynor is a good source of bird seeds (cheap hops and flowers seeds). There are 4 birdhouses so you will need 40 seeds. Disassembling the birdhouse returns the clockwork, so most of the time you only need to bring logs, seeds, chisel, and hammer. A general store on the island also sells chisels and hammers if you forgot one.

Harvesting birdhouses also gives some bird nests which may have tree seeds.

With 8 yew logs and 40 seeds harvest 4 birdhouses before logging out, log in and harvest 4 again