Bird topography
Tertials
The innermost flight feathers, next to the body, which often cover the folded primaries on a perched bird.
Try a bird, a place or a month: "hornbill", "Costa Rica", "shorebirds".
Try a bird, a place or a month: "hornbill", "Costa Rica", "shorebirds".
Bird topography
The innermost flight feathers, next to the body, which often cover the folded primaries on a perched bird.