Dating from 1987, this 24 page book is packed with useful information, colour photographs and line drawings detailing the behaviour of this now very common garden bird.
My "flock" here of at least 4 males are very tame- they'll come within 2 foot of where I'm sitting to stuff their beaks with mealworms or raisins from the low ground table. Or they'll perch on the opposite chair and demand grub. So I'm still not very sure if they were uttering a "chook chook" to inform other blackbirds that I am a ground based predator or "chuck" as a young bird begging for food. I suppose it's kind of in the pronunciation. There's a fair bit I can now look out for including dominant and submissive poses thanks to this little book. Whether behaviour has changed with declining thrush populations in the last 21 years is a moot point. Still it's a good starting point to observe this now surprisingly tame species.