Favourite art instruction books about subjects you draw and paint

Today I propose we all think about the best and/or most helpful art instruction books about the different kinds of subject matter that people draw and paint e.g.

portraiture and people
animals and wildlife
landscape - including urban and marine contexts
still life and floral art
genre art - everyday scenes


Interestingly when I first asked the question about "which is your favourite art book?"

Making a mark - Artists' Favourite Art Books in 2014

It's time to update the list I keep of the favourite art books you like. 

There's no two ways about it - some art instruction books go on and on forever because they have a huge fan base. They get revised and reprinted on a regular basis and some of them sell millions of copies.

Others seem to have the status of a 'best kept secret' where you're only allowed to know about them once you've