I would like to study the flock sizes, home range and territory of these species. What are the factors I should take care of while conducting the study? Kindly help.
The recommended size for Greater Necklaced Laughingthrushes is a 2. You can see it here: https://nationalband.com/wp-content/uploads/2015/03/USGS-Bird-Band-List1.pdf
But a much better resource for you is here: http://www.avianrearingresource.co.uk/species/documents/179.pdf
If you still need advice on this, I can put you in touch with a colleague who has a great deal of experience ringing laughing thrushes in Southeast Asia. Just drop me an email message at mgilbertATwcs.org and I'll introduce you (replace AT with @!).