How to draw bird book preview (Patreon)

Here is a preview of the next how to draw part which is bird tails! Learning about the undertail coverts, flanks, vents etc! I've also included a preview of the book I'm putting together with all these tutorials (which will be available to download for Patreons or free with a physical copy except for postage) so feel free to add suggestions or if more detail is needed on certain parts!