If we begin with the intention to search in A for glyphs belonging to GD11 we of course first take a quick look at how the glyphs are defined which belong there. Birds are not easy to classify and therefore we find a definition structure based on how the birds appear.

GD11 glyphs should have a body seen in front view, but no rule without exception: I have sorted Aa5-9, Ab6-37 and Ab7-29 under GD77 because that feels more right.

The work of sorting all the glyphs in Tahua is described in detail here.