Simon Harrap 
Tits, Nuthatches and Treecreepers [PDF ebook] 

This guide covers all 110 of the world’s species of tits, nuthatches and creepers. The Parulidae ("true" tits), Remizidae (penduline tits) and Aegithalidae (long-tailed tits) form the bulk of the book (78 species), with a further 24 species of nuthatch and eight creepers. The text covers each species under a number of headings: identification, sex and age, voice, distribution and movements, habitat, population, habits, breeding biology, description, movements, geographical variation, relationships, and references.