Generally speaking, by enclosing bird feeders in wire mesh that is large enough to allow ... while still allowing birds to perch and feed. “One of my tube feeders is gravity protected.

Sack feeders, which are nylon mesh tubes filled with nyjer, are used for smaller birds since larger ones can't get through the mesh. With some variations, feeders for bird seed come in three types ...

Tube bird feeders are some of the most common and support ... Look for feeders with holes or mesh on the bottom to allow for ...