tree swallow (tachycineta bicolor) perched on branch, coyote hills regional park, california, united states, north america - 樹燕 個照片及圖片檔
tree swallows (tachycineta bicolor) perched on branch, coyote hills regional park, california, united states, north america - 樹燕 個照片及圖片檔
Tree Swallow expert Bob Cohen checks out one of the 400 bird houses he built to study the tree swallows Credit: The Denver Post
Tree Swallow guards it's nesting box whichis mounted on a post outin the future wetlands area. Tommy Thompson Park story about buildng wetlands out...